Carbohydrates for Recovery

One of the most neglected aspects of recovery is the role of carbohydrates. Regardless of sport, almost all of my athletes reach for a protein shake after their workouts. However, refilling carbs stores is just as important as providing protein to maximise recovery.

Most athletes know that you need plenty of protein for your body to build new muscle, so that is their recovery focus. However, you can increase your gains if you pair that protein with some carbohydrates. First, the insulin spike caused by the carbohydrates tells your muscles to absorb both the protein and carbs from your bloodstream and into your muscles much faster. This accelerates your recovery.

Second, providing the building blocks of new muscle isn’t enough. Your body needs enough energy to actually do the work – and carbs provide a quick, easy source of energy. Whether you are a strength athlete looking to gain muscle or an endurance athlete trying to increase stamina, you will better adapt to your training if you body has enough energy in the hours after exercise.

Another reason to focus on carbohydrates for recovery is to perform well in your next training session. Most athletes get better results when they are able to train hard, recover, and go again the next day. As discussed previously (see Carbohydrates for Exercise: Before) starting your next workout with full muscle glycogen stores is key for performance. By consuming carbohydrates as soon as possible after exercise, you ensure a great next session.

The good news is that, if you have 24 hours between exercise bouts, your body will refill your glycogen stores naturally from your normal diet. Assuming your diet has enough carbs in it (See Macronutrients: Carbohydrates), no special strategy is needed. Particularly in the first 3-4 hours after a tough session, your muscles act like carbohydrate sponges.

However, when there is less than 24 hours between exercise bouts, carbohydrates stores are the limiting factor in performance. The shorter the gap between workouts, the more you need to focus on getting the carbs in. For example, if the gap between workouts is 4 hours or less, you’ll want at least 1g/Kg of bodyweight of carbs per hour. This can be a mix of simple and complex carbs, with some protein and fibre, but lower in fat (to speed digestion).

Remember, it is only when we give our bodies adequate rest and the right nutrition that we get fitter!

 

REFERENCES

Alghannam, A. F., Gonzalez, J. T., Betts, J.A. 2018. Restoration of Muscle Glycogen and Functional Capacity: Role of Post-Exercise Carbohydrate and Protein Co-Ingestion. Nutrients. 2018 Feb 23;10(2):253. doi: 10.3390/nu10020253.

Kerksick et al. 2017. International Society of Sports Nutrition Position Stand: Nutrient Timing. J Int Soc Sports Nutr. 2017; 14: 33. doi: 10.1186/s12970-017-0189-4

Thomas, D.T., Erdman, K. and Burke, L. 2016. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2017 Jan;117(1):146. doi: 10.1016/j.jand.2016.11.008.

Vitale, K. and Getzin, A. 2019. Nutrition and Supplement Update for the Endurance Athlete: Review and Recommendations. Nutrients. 2019 Jun; 11(6): 1289. doi: 10.3390/nu11061289

Carbohydrates for competition

Sport is all about performing well on competition day. No matter how well training goes, if you can’t produce the goods during an important race or match, you will not succeed. And part of being able to perform well repeatedly on competition day is getting your nutrition right.

As discussed previously, our bodies store enough carbohydrates to last for about 60-90 minutes of moderate exercise. Almost all exercise will use up the body’s carbohydrate stores, it’s just a question of how fast. Longer and higher intensity workouts will deplete those stores faster than shorter, lower intensity workouts.

If you have 24 hours between exercise bouts, your body will refill your glycogen stores naturally from your normal diet (assuming your diet has enough carbs in it – See Macronutrients: Carbohydrates). No special loading strategy is needed.

However, when there is less than 24 hours between exercise bouts, carbohydrates stores are the limiting factor in performance. In training, this may not matter much. For example, if you do a high intensity, skill-based workout in the morning, this will deplete your glycogen stores. But if the second workout is an easy fat burning running or cycling session in the afternoon, you may not need or want full glycogen stores.

However, if that second workout is also high intensity, then you absolutely need to refill those glycogen stores as fast as possible. This is especially true in a competition situation, where you may have repeated bouts of high performance exercise over the course of a day or weekend. For example, in sports like swimming or athletics, there might be heats, followed by quarter or semi-finals, followed by a final – all on the same day.

What you can eat between races is determined by how much time you have to digest. Most tummy troubles during exercise are caused by having too much food in the stomach. The shorter the time between sessions, the more you need to stick to easy to digest simple carbs with limited protein, fat, and fibre.

Time between exercise boutsCarb strategyExamples
Less than an hourTry to have at least 30g of carbs in the form of simple sugars.

 

Limit protein, fat, and fibre.

Sports drinks, juice/smoothies, energy gels, banana, grapes, even jelly sweets.
One to two hoursTry to have at least 1g/Kg of bodyweight of carbs, mostly simple sugars.

 

Small amount of protein and fibre.

Fruit, granola bars, low fat fruit yoghurt, white bread jam sandwich, simple cereal and milk (rice crispies, cornflakes, etc.)
Over 2 hoursAt least 1g/Kg of bodyweight of carbs per hour, mix of simple and complex crabs.

 

Some protein and fibre, but still low fat.

Overnight oats or porridge, sandwich with a couple slices of turkey or ham (no cheese), pasta salad, etc.

 

All served with a side of juice or sports drink and other high carb snacks.

As a performance nutritionist, some of my biggest wins come when I improve an athletes’ nutrition on competition day. I often find that athletes are not consuming the right carbs, at the right times, in the right quantities, to maximise performance. Once we fix that, they go on to produce their best performances when it counts.

 

REFERENCES

Kerksick et al. 2017. International Society of Sports Nutrition Position Stand: Nutrient Timing. J Int Soc Sports Nutr. 2017; 14: 33. doi: 10.1186/s12970-017-0189-4

Thomas, D.T., Erdman, K. and Burke, L. 2016. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2017 Jan;117(1):146. doi: 10.1016/j.jand.2016.11.008.

Vitale, K. and Getzin, A. 2019. Nutrition and Supplement Update for the Endurance Athlete: Review and RecommendationsNutrients. 2019 Jun; 11(6): 1289. doi: 10.3390/nu11061289

Carbohydrates for Exercise: During

Carbohydrates are our bodies’ preferred energy source, especially when exercising. Running out of carbs usually results in a dramatic drop in performance. However, you can prevent that by taking on more carbohydrates during longer exercise sessions.

Our bodies store enough carbohydrates to last for 60 to 90 minutes of moderate exercise. You do not need to take on extra carbohydrates for sessions lasting less than an hour! However, for sessions longer than that, you should consider topping up.

Exercise duration Type and Intensity Carb strategy
Less than an hour Skill, strength, or easy endurance training (cycling, running, etc.) None (stick to water)
  Very intense longer interval session (i.e. 45 min of HIIT)

May want to have 30g carbs per hour.

One to two hours Skill or strength training with frequent rest periods May want to have 30g carbs per hour.
  Endurance or team sports, whether continuous or interval

30-60g carbs per hour, starting 30 min into the session.

Over 2 hours Skill or strength training with frequent rest periods 30-60g carbs per hour, starting 30 min into the session.
  Endurance or team sports, whether continuous or interval Potentially 60-90g carbs per hour, from both glucose and fructose.

For example, if I’m doing an easy two hour long run, I might have an energy gel with 20g of carbs every 30 minutes (40g carbs per hour). On the other hand, if I am doing a longer race, I might have a gel with both glucose and fructose every 20 minutes, so I’m getting 60g of carbs per hour.

During exercise, stick to simple sugars which are easy to digest. This can be in the form of sports drinks, energy gels, high carbohydrate energy bars, fruit (such as bananas or raisins) or even jelly sweets. Complex carbohydrates (oats, wholemeal bread, etc.) have too much protein and fibre, and are likely to cause stomach upset. Likewise, sweets high in fat (like chocolate) are also harder to digest when exercising.

Despite all the recent hype about fasted training and teaching our bodies to use fats for fuel, carbs are still king for exercise performance. Carbohydrates are simply broken down into usable energy much faster than fats (even if you are fat adapted). So if you want to perform at your best, maintain a steady supply of carbs during exercise.

 

REFERENCES

Kerksick et al. 2017. International Society of Sports Nutrition Position Stand: Nutrient Timing. J Int Soc Sports Nutr. 2017; 14: 33. doi: 10.1186/s12970-017-0189-4

Thomas, D.T., Erdman, K. and Burke, L. 2016. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2017 Jan;117(1):146. doi: 10.1016/j.jand.2016.11.008.

Vitale, K. and Getzin, A. 2019. Nutrition and Supplement Update for the Endurance Athlete: Review and RecommendationsNutrients. 2019 Jun; 11(6): 1289. doi: 10.3390/nu11061289

Carbs for Exercise: Before

Getting the right carbohydrates at the right time can make or break any athlete. It doesn’t matter if you are a recreational cyclist looking to lose weight, a dedicated gym goer looking to gain muscle mass, or an elite footballer looking for peak performance. Fundamentally, having enough energy to get the best out of your workouts is key, whatever your goals.

In most cases, you want to start your workout with a good supply of energy. Fasted training, where you train on an empty stomach before breakfast, has become very popular recently. And it is true that this encourages your body to use fats as fuel during the workout. But this only leads to weight loss if you are in a calorie deficit over the whole day. And training on an empty stomach makes exercise feel much harder. Training on empty usually leads to a lower quality workout – you can’t lift as much weight or run for as long.

Carbohydrates are our bodies’ preferred energy source, especially when exercising. Exactly how many carbs you need depends on the type of workout. For most sessions a pre-workout meal with 0.5 to 1.0g/Kg of carbs is the right amount of fuel. For example, if I weigh 65Kg and I am doing an easy run or standard strength training session, that’s 33 to 65g of carbs in my pre-workout meal/snack. If you have a much longer or harder session planned, such as a long run or a full football match, then you need 1.0 to 1.5g/Kg of carbs beforehand.

Ideally you would have this meal 2-3 hours before your training session. This gives you enough time to digest, but ensures the energy is still there when you need it. The closer you are to your session, the more you need to rely on smaller snacks which are low in protein, fat, and fibre. This is especially true if you often get an upset stomach while training.

What you eat depends on how close you are to your session. Basically, if it’s 3 hours before, you can have a normal meal with complex carbohydrates, protein, and fats. If it’s two hours before, go easier on the protein and fats. Think porridge or wholegrain cereal with milk. If it’s less than an hour until you start exercising, then you want to stick to simpler carbs which are low in protein, fat, and fibre. If you are running from work/school straight to training and can only eat right before, your best bet is straight simple sugars, such as a banana or a bottle of sports drink.

For athletes, the key to success is consistent, quality workouts. For most people, a good supply of carbs before workouts ensures they can train hard, recover, and go again the next day.

 

REFERENCES

Kerksick et al. 2017. International Society of Sports Nutrition Position Stand: Nutrient Timing. J Int Soc Sports Nutr. 2017; 14: 33. doi: 10.1186/s12970-017-0189-4

Thomas, D.T., Erdman, K. and Burke, L. 2016. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2017 Jan;117(1):146. doi: 10.1016/j.jand.2016.11.008.

Vitale, K. and Getzin, A. 2019. Nutrition and Supplement Update for the Endurance Athlete: Review and RecommendationsNutrients. 2019 Jun; 11(6): 1289. doi: 10.3390/nu11061289

 

Eating for a Marathon: Eating Enough

One of the most common issues I see as sports nutritionist is athletes not eating enough. Strangely, it doesn’t seem to matter if they are trying to lose, gain or maintain their weight. And more often than not, it is completely inadvertent. Training increases but the athlete keeps eating the same amount as before. Or they follow the recommended portion sizes on packaging, which are for a 2000 kcal diet – when they are burning over 3000 kcal per day!

Not eating enough can lead to a syndrome known as Relative Energy Deficiency in Sport (RED-S) (previously known as the Female Athlete Triad). Symptoms include:

  • Irregular or missed periods in women and low testosterone in men
  • Decreased adaptation to training (you don’t progress) and decreased performance in competition, despite training harder than ever
  • Low mood and fatigue, despite getting enough sleep
  • Frequent injuries, particularly bone injuries like stress fractures
  • Frequent illnesses like colds and flu
  • Poor body composition – you can’t gain muscle mass or lose body fat

The second item on the list was of particular concern to me. My goals this year are all about performing well in the marathon – not losing body fat or looking a particular way. To set a new marathon PB, I needed to hit all my training targets. That meant I needed to eat enough to go hard in training, recover, and go hard again the next day. As my mileage and hours of training increased, so did the number of extra calories I had to consume. And it quickly became apparent just why so many of my athletes struggle to eat enough! Turns out, it can be hard to eat more than 3000kcal per day while sticking to healthy foods.

It was tempting to just add more treats to my diet. After all, junk foods – like cake or chips – taste so good because they are loaded with fat, salt and simple carbs (sugar, white flour, etc). This ramps up the calorie count. And I did sometimes have more cake or ice cream than I normally would. Problem is, these foods lack the protein, vitamins, minerals and antioxidants that speed up recovery. So you get the calories, but not much else in the way of nutrition.

Long run days, where I would burn over 1000 extra calories, were a particular challenge. After a bit of trial and error, I did find some meals that were both nutrient and calorie dense. For example, my typical breakfast before a long run is porridge made with gluten free oats, skim milk, a small chopped apple, ground flaxseed, raisins, pumpkin and sunflower seeds. Together with a large mug of tea with milk and sugar, that’s over 700Kcal and over 100g of carbs. And that fuel is a mix of both complex carbohydrates (oats), simple sugars (in the fruit) and healthy fats (from the seeds).

In the end, I used a variety of techniques to increase my calorie intake without resorting to a load of fat laden junk food. I increased the portion sizes of my usual healthy foods, which took some getting used to. In particularly, I needed enough complex carbohydrates to fuel training, like oats, sweet potatoes, quinoa, pasta, etc. If I had a particularly heavy training session, I would have a couple different carbohydrate sources in the same meal, such as butternut squash in a risotto, or a curry with both rice and naan bread. I also added more healthy fats to my diet, mostly from nuts, seeds and oily fish. And I did enjoy some higher calorie, higher fat foods like cheese (high in calcium and protein) and liver pate (high in iron, which is often low in runners).

In August I went for a second round of physiology testing, and it was all good news. My VO2 max had gone up by 6%, my lactate thresholds had shifted to higher speeds, and I was using more fats as fuel. Not to mention the new half marathon PB I also had in August. Eating enough to fuel proper hard training works!

Eating for a Marathon: Carb Loading

Part of marathon preparation is doing some shorter races in the lead up to the big day. Shorter races can be a good gauge of how your training is progressing – many people set new personal best times at shorter distances when training for a marathon. Shorter events also give you the chance to practice all your routines around racing – training the week before, your clothing choices, pacing during the race, and of course, your nutrition.

I had looked to do at least one 10K and a half marathon before my full marathon in October, but those races were cancelled. So, with the help of my husband, I did a couple of faux races. This involved getting up bright and early, going through my pre-race routines (same breakfast, warm up, etc.), driving to a park 20 minutes away (so I was less familiar with the route), and starting at exactly 9am. For the half marathon I even did a full, three day, carb loading diet – and boy, was that an eye opener!

Carbohydrates are stored in the liver and muscles as glycogen. When we exercise, that glycogen is broken down for energy. The higher the intensity of the exercise, the faster you burn through your glycogen stores. In training, having slightly depleted glycogen stores is normal, and can even encourage the body to use fats as fuel (see the previous post on Using Fats as Fuel). However, in a race situation, you want all the carbs you can get to maximise performance.

Carb loading is when an athlete eats a lot of carbohydrates in the days before a race, to maximise glycogen stores. Generally speaking, you only need to do this if the race will last more than 90 minutes. There are various ways to carb load, but recent research has shown that eating at least 6g/Kg of carbohydrate, and up to 12g/Kg, in the 2-3 days leading up to the race is enough to fully top up glycogen stores1. Especially as most people are resting or training very lightly in the days leading up to their race.

This is well known and I have dispensed this advice to my athletes for years. What I didn’t realise is just how much carbohydrate that is, and how hard it is to eat that much! Especially if you are trying to keep the calorie count within reason. For example, I weigh 62 Kg so 6g/Kg is 372g of carbohydrate, so that’s my minimum target. The day before my half marathon I ate:

Breakfast: Two boiled eggs with two gluten free crumpets topped with butter and jam, a 200ml glass of pineapple juice, and a large mug of tea with milk and sugar.

Morning Snack: A mug of tea with milk and sugar and two small, gluten-free custard creams.

Lunch: Small grilled mackerel fillet with plenty of rice, steamed broccoli and carrots. Watermelon for dessert followed by a mug of tea with milk and sugar and two small, gluten-free custard creams.

Afternoon Snack: Three slices of toasted gluten free bread topped with reduced fat Brussels pate and caramelised red onion chutney, with 36g of dried apricots on the side. Two satsumas (small oranges) shortly afterwards.

Dinner: Free from spaghetti with homemade tomato sauce and a beef and lentil meatball, topped with a small amount of Parmesan cheese. Frozen yoghurt ice lolly.

In total that was 2660 kcal – at least 500kcal more than I would normally eat on a rest day. Of that, 411g was carbohydrates, including 146g of sugar – well above the recommended. That’s only 6.6g/Kg of carbs and I have to say I felt stuffed! I can’t imagine eating the amount of food an 80 Kg runner would have to take in to get above 7 or 8g/Kg of carbs. Even though, as a nutritionist, I have created menu plans that do exactly that!

You’ll notice my intake of processed foods was well above normal – I am not in the habit of having crumpets, bread and biscuits all in the same day! Part of that was trying to avoid too much fibre. We get most of our fibre from carbohydrates (wholegrains, vegetables, etc.), so carb loading can mean a big increase in fibre. Normally a high fibre diet is good, but too much fibre too close to a race can lead to gasto distress during the race. So many athletes switch to lower fibre, “white” carbs when carb loading. Hence my breakfast of crumpets rather than the usual porridge.

There was also 88g of protein (1.4g/Kg) and 73g was fats. This is a perfectly healthy amount of both but probably too much when carb loading. At the time I chose mackerel because it’s an oily fish high in Omega 3 fatty acids, which reduce inflammation and help with recovery. And I had pate on my toast because it’s high in iron (often low in runners) and vitamin A. However, both are high in fat and in hindsight, I’m not sure I need. I could have kept the calorie count down by choosing lower fat white fish and a lower fat, high carb toast topping (like honey or jam).

Is carb loading worth it? Yes! I had a really good half marathon, setting a new PB. But if I’ve learned anything, it’s that carb loading is more complicated than even I thought (as demonstrated by the length of this post)!

 

References

1. Vitale, K. and Getzin, A. 2019. Nutrition and Supplement Update for the Endurance Athlete: Review and Recommendations. Nutrients. 2019 Jun; 11(6): 1289. doi: 10.3390/nu11061289

Eating for a Marathon: Weight Loss

Last week I talked about some of the techniques I used to encourage my body to use fats as fuel. Most people assume that burning more fat during exercise will result in weight loss.  Sadly, this is not true. To lose weight, you need a calorie deficit – to be taking in less energy than you use. No calorie deficit, no weight loss, as I experienced first hand.

Like most people, I put on a few pounds over Christmas, and on 1 January 2020 I weighed in at 65.7Kg and 30% body fat. I had lost some body fat in January and early February, but I then went to Canada for a couple of weeks for a wedding. When I got back, I weighed 65.4 Kg and 29% body fat – basically back to where I was in early January. As I got back into training, I was hoping the healthier eating and increased running would lead to fat loss.

By the first of April I was down to 64Kg. However, despite an ever increasing training regime, I stayed at 64Kg and 29% body fat. Health and aesthetic benefits aside, I had another reason for wanting to shed some weight. Studies have shown that runners are, on average, two seconds per mile faster for every pound they lose. If I lost 5lbs of fat, I should be a good 4 minutes faster over the course of a marathon.

So I decided to switch up my training and nutrition for a couple of weeks to encourage weight loss. Up to that point, I’d been eating a base of around 1800Kcal per day, then adding exercise calories on top. For example, if I burned 400Kcal on a run, I ate 2200kcal that day. From the 18th of May, I switched to a 1500kcal base. I was still adding the exercise on top, so in reality I was often getting 2000kcal per day.

To ensure I was losing fat and not muscle, I increased by protein intake – at least 1.8g/Kg per day. I did keep carbohydrates in my diet, but was much more strategic in when I had them. I tried to have higher carbohydrate meals after exercise, and lower carbohydrate meals at other times. I also kept an eye on the amount of fat in my diet, to keep the calorie count down. But it wasn’t exactly a low fat diet either. Of course, there was no alcohol and very few refined sugars (the kind you find in chocolate, cake, etc.).

I also switched up my training to further encourage fat burning. On Mondays, Wednesdays and Fridays I went for a 45 minute walk before breakfast, while on Tuesdays and Thursdays, I did an hour long fasted run. I kept my hill sprints on Monday afternoons, and my long run on Saturdays. I was up to an hour and a half on the long run, so I did have breakfast before, but I didn’t take on any carbs during the run. There were also a couple of HIIT/strength training sessions per week (as normal) and I made an effort to get 10,000 steps a day, most days of the week.

And it worked. On June first I weighed in at 61.8Kg and 26.3% body fat. In two weeks I had lost over 2kg and most of that was body fat, not muscle. However, it was not easy. I was often tired and hungry, despite a high protein and high fibre diet. And the quality of my hill reps and HIIT sessions really suffered – I just didn’t have the energy to push myself.

In some ways losing weight to get faster is a short cut. In two weeks I lost enough weight to take 4 minutes off my marathon time. It could take months to get that much from training. And it can be tempting to keep going, especially when you know you have plenty of body fat to lose (26% body fat is high for a runner). But it is a game that catches up with you in the end – as I discovered, your training really suffers.  I decided that I would get better results by hitting all my training targets, rather than chasing a lower body weight.

The good news is that on September second I was still 61.8 kg –  no more, no less. All while fuelling ever increasing amounts of training!

Please note: This is a description of my personal experience of losing body fat to meet a specific performance goal. It is not meant to be taken as a recommendation for anyone else. Using these techniques to lose weight may not be appropriate for you and your circumstances.

Eating for a Marathon: Using Fats as Fuel

As it turns out, nine months is a long time to be training for one event. So like most athletes, I do follow a periodized training plan, where different phases of training have slightly different goals. Being a sports nutritionist, I also have different nutrition goals to support my training during my different phases. And one of my first goals was to improve my body’s ability to use fats as fuel.

The Why

As a sports scientist I love data. So in January, I booked in for some physiology testing at Loughborough University. The information you get from this type of testing can then guide your training – do I need more long slow runs to build my aerobic base, or more high intensity intervals to improve VO2 max?

Aside from showing how little running fitness I had in general, the testing showed I was relatively poor at using fats for fuel, even at very low speeds. This is a particular problem for slower marathoners such as myself. See, even highly trained athletes can only store enough carbohydrates to get through 60-90 minutes of exercise. Of course, you can top up your carbohydrate stores during exercise by having energy gels or sports drinks, but most runners can only tolerate 60g of carbohydrates per hour (or less).

Based on previous experience, I will be burning at least 60Kcal per Km, which is over 2500Kcal for a whole marathon. Assuming I have enough carbs stored in my muscles for the first hour (about 550 Kcal), then take in 60g of carbs per hour (about 960 Kcal), that leaves 1000Kcal my body has to get from somewhere. If I can teach my body to use fats as a fuel over carbohydrates, then I am less likely to run out of energy before the end of the race.

The How

The easiest way to force your body to use fats as fuel is to eat a high fat, low carbohydrate diet. However, I’ve been down that road before, and I can’t say it appeals. Especially as I would have to maintain such a diet for over 9 months of training! Plus, research has shown that while high fat diets can increase time to exhaustion in endurance tests, top end sprint speed and power tend to decrease1. You wouldn’t think that matters in the marathon, especially for someone targeting four and half hours. But another result of my testing was a need to improve my VO2 max and overall running speed. That meant regular sprint intervals and faster paced training sessions. To get the most out of these sessions, I would need full carbohydrate stores.

An alternative way to encourage fat burning is to periodize your carbohydrate and fat intake2. This involves eating more carbohydrates on days with high intensity, high speed sessions, and fewer carbohydrates on rest and easy days. You can also teach your body to use fats as fuel by fasting and incorporating fasted training into your plan3. This is where you go for a run first thing in the morning before breakfast, after your usual overnight fast (about 12 hours since dinner). As you will have used up most of your carbohydrates as you sleep, your body is forced to rely on fats for fuel. It does feel harder, which is why these runs tend to be less than an hour at an easy pace.

Here’s an example of how I incorporated periodized carbohydrate intake with fasting into my training (in March, April and early May):

  • Monday: Moderate to high carbohydrate diet. Sprint interval session on hills in the afternoon.
  • Tuesday mornings: Fasted easy run before breakfast, then eat normally the rest of the day (moderate carbohydrate ~4g/kg).
  • Wednesdays: Rest day. Small, very low carbohydrate breakfast (usually a two egg cheese omelette) and fasted for the rest of the day (only water and green tea).
  • Thursday: Higher carbohydrate breakfast and lunch (more than 1g/kg carbohydrate in each meal) before a marathon pace run on Thursday afternoon. Back in March, marathon pace was a Tempo run (a pace I could only sustain for 15-20 minutes).

The Result

I would not recommend the above schedule to everyone, but it seemed to work for me. I was able to increase the pace of my long, slow runs while keeping the same effort (I use a heart rate monitor), indicating I was getting better at using fats for fuel. It did have it’s drawbacks though, which I will discuss in the next post.

When it comes to sports nutrition, I it very true that everyone is an experiment of one.

References

As always, there are many papers on this topic, but I have tried to provide open access ones.

  1. Burke et al. 2020. Adaptation to a low carbohydrate high fat diet is rapid but impairs endurance exercise metabolism and performance despite enhanced glycogen availability. https://doi.org/10.1113/JP280221
  2. Jeukendrup, A. 2017. Periodized Nutrition for Athletes. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5371625/
  3. Aird, TP et al. 2018. Effects of fasted vs fed-state exercise on performance and post-exercise metabolism: A systematic review and meta-analysis. 10.1111/sms.13054

New Series! Eating for a Marathon

Warning! This is going to get personal.

I’ve been running a lot this year. Many people took up running in March, as a way to get outside and exercise while gyms were closed. However, my running journey began in December. After a difficult and disappointing 2019 (including a death in the family) I decided I needed a new big goal to refocus my training. I had run my first marathon with my husband in 2018, but bad weather and inconsistent training meant a disappointing time. So I decided 2020 was the year I would tackle 42.2 Km properly, with 9 months of dedicated training.

Many things did not go well when I rant my first marathon in October 2018. Training had been inconsistent throughout the summer months (among other things, I took a trip to Canada) and my longest run before the race was only 24 Km. On the day it was cold, pouring with rain and quite windy. Our chosen race had a very dodgy route in the middle miles, including running next to busy roads with no pavement. From 30 Km in, we started taking longer and longer walk breaks. Needless to say, it was not a good time – in either sense of the word. The one bright spot is that we did, in fact, finish the race.

Knowing the beast that awaits and the number of things that can go wrong, I’ve set several goals this time around. To start, just finishing the race without walking (except where necessary, such as at busy aid stations) would be a step up. Secondly, to set a new personal best time – so anything under five and a half hours. Thirdly, should training go well and the weather co-operate on the day, to run the marathon in less than four and half hours. This last is a significant stretch as, at the beginning of January, I couldn’t even manage 5 Km at the pace I would have to sustain for 42 Km come October.

Strangely, going into lockdown in March produced some of the most consistent training I’ve ever had. With very few fixed time commitments  sticking to my marathon training plan became a way of scheduling my days. I also had more time to focus on recovery such as stretching and foam rolling, or even taking a nap if needed. As my runs got longer, I couldn’t help wondering how anyone does serious marathon training with a full-time job.

Of course, for me, part of getting my training right was getting my nutrition right. Even after years of successfully advising a variety of endurance athletes on their nutrition, the realities of doing it for myself produced some surprising insights. This is what I will be sharing in a new series of posts. Everything from eating for training and long runs, to carb loading and weight loss. Yes, this is nutrition for runners, but much of the information will apply to anyone who is active, whatever their goals.

Sadly, like so many others, the race I had registered for in October has now been cancelled. But having come this far, I still plan to run 42.2 Km on the day as planned. As Garmin is my witness, a marathon is going to happen!

Why Protein is King for a Lean, Toned Physique

It’s the holy grail of most athletes at every level: How to gain muscle mass while losing body fat. More and more, I’m seeing athletes who are a healthy weight, but have higher levels of body fat than you would expect from their level of training. So this month I’ll be looking at what you should eat to encourage fat loss, without sacrificing muscle mass or performance. Starting with something we’re hearing a lot about lately: Protein.

For all the hype about effects of fats and carbohydrates on fat loss and athletic performance, the first thing to get right is the amount of protein in your diet. Protein is necessary to grow and repair body tissues, including muscle. And when you exercise, you damage your muscles and other tissues. If you are not eating enough protein, your body will be unable to turn all that training you’re doing into increased strength and stamina. What’s more, simply eating 20g of protein causes an increase in muscle protein synthesis (muscle building). If you spread your protein throughout the day, you can stimulate muscle building after every meal and snack. The more muscle you have, the more calories you burn at rest. This is why the muscle building combination of more protein and exercise can really accelerate fat loss.

When you go on a calorie restricted diet, your body breaks down both stored fat and muscle to make up the energy deficit. The more restrictive the diet and the faster the weight loss, the more likely it is that the weight is coming from muscle and water as well as fat (this is why I keep emphasizing that the goal is fat loss, not weight loss!). However, research has shown that consuming a high protein diet can counteract this.  Protein is also the most satiating of all the macronutrients – it makes you feel full, which makes it easier to eat less. It can also reduce cravings for sweets treats. Strangely enough, sometimes when people crave sweets, especially after a workout, what their body actually needs is more protein.

The current guidelines are for 0.6g of protein per kilogram of bodyweight per day for a sedentary person. However, if you are an athlete looking to drop body fat, you need at least 1.5g per kilo per day, and up to 2.4g per kilo if you are cutting calories. For example, if you weigh of 70kg (11 stone), that’s 105 to 168g of protein per day. This may sound like a lot but is quite doable if you include protein with every meal and snack. For example, you could have eggs with breakfast, a tuna sandwich and a glass of milk for lunch, yoghurt and nuts as a snack, and chicken and veg for dinner.

If it’s a lean, toned physique you’re after, plan your meals around protein!