I’m continually amazed at the things I see cyclists eat during and after rides but am never surprised to see the effects ranging from loss of energy through loss of concentration leading to mistakes and sometimes injury to a full-fledged bonk. While proper nutrition is one of the most important factors affecting long-distance cycling on a day-in, day-out basis, there is so much misinformation out there that knowing what to eat and when to eat it can be difficult. Part of the reason for this is that nutrition science is in its’ infancy; much remains to be learned and nutritional theories are often revised as new information becomes available. Another reason is that the subject of sports nutrition is confused in the minds of many with the subject of dieting. Unfortunately, dieting in the US is a multimillion dollar industry that is fat with fads and outright foolishness. Finally, many cyclists seem to have a deep emotional commitment to their cycling-related eating habits and resist change. What follows is a basic introduction to cycling nutrition based on broad areas of agreement found in research related sources on cycling and endurance sports nutrition.
Cycling nutrition is all about providing fuel for the muscles you are using as you ride down the road. When muscles work they burn glucose. In order to make sure that there is enough energy to fuel the muscles the body converts excess glucose to a chemical called glycogen and stores it in the liver and the muscles themselves. When activity takes place the glycogen is released, converted back to glucose, and used as the fuel needed to power the muscles. Under normal conditions the body stores enough glycogen to provide sufficient energy for typical everyday activities. However, long bike rides or multiday bike rides demand more energy than the body can store in the form of glycogen. Where does the energy come from to keep you riding for many hours and many days? The answer breaks down into two topics: Eating during a ride and eating after the ride.
Eating during the ride
An adult in relatively good condition can store enough glycogen to supply the muscles with energy for about 90 minutes of steady exercise. After that, if you haven’t found another source of glucose, you’re going to run into difficulty. For endurance athletics, which for our purposes is a bike ride lasting more than 90 minutes, there is one universally agreed on source for the glucose you need – carbohydrates. Why carbohydrates? Primarily because their chemical structure is such that they can be broken down quickly and efficiently into useable glucose or storable glycogen. Fats contain twice as many calories as carbs and hence have the potential to provide more energy. However, breaking down fats into useable forms of energy is a slow process. If you eat fat loaded food during a ride, the ride will probably be over by the time the fats have been processed to the point where you can get energy from them. In the meantime, all the energy used in breaking down the fats hasn’t been available for powering the muscles. At the time of this writing a prominent diet fad holds that carbohydrates are bad and should be avoided. It’s important to remember that exercise nutrition and dieting are two entirely different things. Carbs are absolutely essential for the long-distance cyclist.
Where do you get the carbs you need during a long ride? Some high-carb foods like pasta and rice are impractical to eat during a ride; you need high carb, low fat sources that you can easily carry with you on the bike. Good on-the-bike foods include raisins, dates, bagels, and low fat fig newtons. Energy bars are a terrific source of carbs. For example, Harvest bars have 35 grams of carbs and Powerbars have 45 grams. There are also energy gels made specifically for endurance athletes such as Power Gel or Goo that have very high doses of carbs. Sports drinks like Gatorade are good sources of carbs and they also have a healthy dose of the salts and fluids you need. I like chocolate Powerbars, Laura likes Power Gel and we both like low-fat fig newtons on the bike. If you eat high density carb supplements like energy bars or gel, make sure to drink plenty of water with them or they will sit like sludge in your stomach and you won’t get the quick transfer of carbs into blood glucose you need.
We have recently discovered a terrific food to eat at rest stops – Dole frozen fruit bars. They’re a kind of popsicle can be found in the freezer with ice cream bars if a convenience store has them at all. Two Dole bars have more carbs and less calories than a Harvest Bar. Because they are basically frozen juice with bits of fruit I expect they will clear the stomach much faster than a Harvest Bar (which contains fat and protein that slow digestion) to provide energy when you need it during the ride. They are also very refreshing and a joy to eat on a hot day.
When do you eat? A common cycling mantra is “Eat before you’re hungry and drink before you’re thirsty”. This is excellent advice. By the time the body reacts to low levels of fuel or fluid and sends hunger and thirst signals it’s too late. Rather than stopping and eating a large amount of food (such as lunch) mid ride, nibble high carb foods frequently throughout the ride. This not only provides immediate glucose, it can help protect the body’s glycogen stores; if the muscles are burning glucose from the low-fat fig newton you just ate, it’s not burning your stored glycogen. Try to ingest some carbohydrates every 30 minutes or so. Start eating during your first hour on the bike. The sooner you begin drawing needed energy from food intake the longer you can keep a reserve of stored glycogen.
Eating on the bike like this isn’t easy, especially in the first hour when you probably won’t feel hungry. Stopping to nibble makes eating even more of a hassle and hence makes it more likely you’ll skip it. Bad idea. Carry nibble food in a fanny pack or your rear jersey pockets and learn to eat while you ride.
It takes a surprising amount of practice to get in the habit of eating regularly. Practicing eating may sound like a crazy idea but it’s very easy to forget and run into trouble later. Many people have heard the story of how Lance Armstrong got wrapped up in the race on one of the difficult mountain stages of the 2000 Tour de France, forgot to eat, and bonked on the final climb of the day putting his yellow jersey at risk. Bonking is no fun and Armstrong has since called it the worst day of his life on the bike.
Unexpected events or an atypical ride can also disrupt eating with unhappy results. During the summer of 2002 Laura and I rode in a week-long Glacier National Park tour. (Laura built a website about this tour which you can check out in the Glacier National Park blog attached to this site. She not only included ride diaries and lots of nice pictures but also links to a wealth of information about many of the things we experienced on the tour. She did a terrific job, check it out). We approached this tour as a cycling vacation rather than a training opportunity and rode at a much slower pace than we usually do. We also stopped and had lunch mid-ride with other riders on the tour which was something we had never done before. The lunches were great with good company and good food but we had no experience in how to incorporate eating a meal into a long ride. The first time we did this I screwed it up. The first day we ate lunch we were about 20 miles from finishing the ride and I began to experience the early stages of a bonk. What had happened? I hadn’t pigged out at lunch but even a small lunch is much more than I would typically eat during a ride. My stomach was full and the idea of eating either didn’t occur to me or, if it did, wasn’t attractive. Although my stomach was full, it was full of mostly protein and fat which could not be broken down fast enough to provide the energy I needed before the end of the ride. I wasn’t getting any energy from food input and my glycogen stores were exhausted by this time so I started to bonk. Those last 20 miles were miserable; the temperature had dropped, we were riding directly into a headwind, and I was shivering uncontrollably by the time we reached the lodge where we were scheduled to stay the night. Fortunately, the lodge had an enormous fire roaring in the center of the main area with a bench-like hearth running around it on all four sides. While we waited for the van to arrive with our luggage, I sat huddled by the fire slowly recovering and getting warm. The lesson I learned? Practice eating under the circumstances in which you are going to ride so you don’t get surprised.
Bonking
So what’s this bonk cyclists hate? Bonking is what cyclists call hypoglycemia or low blood sugar. In addition to being the energy source for working muscles, glucose is the sole energy source for the brain and nervous system. This means that when there isn’t enough glucose in the blood stream to meet demand you will experience physical, mental and emotional effects. Symptoms can include irritability, combativeness, lethargy, indecision, and loss of the ability to focus attention. In severe cases, disorientation and even hallucination can occur although most people will have quit riding long before this happens. Of particular danger for cyclists are a narrowing of vision and a loss of balance. If you find yourself staring at the road right in front of your bike and feeling bummed out and discouraged because the rest of the ride seems like too much to bear, be aware that you’re probably in a bonk.
Sooner or later you’ll bonk. What do you do? As soon as you can, stop and eat some carbs that can be rapidly processed by the digestive system. Examples include sports drinks, fruit juice, energy gels (make sure you drink plenty of water with these), sugar cubes or sweet candy like gumdrops or jellybeans. Energy bars will work but they take a bit longer to digest. Pay careful attention to what you eat for the rest of the ride and make sure you keep your glucose level up by regularly and frequently taking in fast absorbing carbs. Sports drinks are very good for this. Perhaps the hardest part of reacting to a bonk is mental. You need to try and be aware that you’re not thinking clearly and not being as aware of what’s going on around you as you need to be to ride safely. Forcibly arouse yourself from your lethargy and pay extra attention to what’s happening around you. Of course this is easier said than done; it’s not easy to be aware that you’re not thinking clearly when you’re not thinking clearly.
Eating after the ride
It’s the third day of a multi-day ride like the Glacier Park tour and the dejected cyclist says “I don’t know what’s the matter with me. I just don’t seem to have any energy today.” The root of this problem, and it’s a common one, usually lies in what the rider did in the first 30 minutes after they got off the bike the previous two days. It is surprising how little is known or understood about this by otherwise experienced cyclists. What you eat after the ride is probably the single most important factor affecting how you will fare if you’re riding more than 90 minutes a day for more than 2 days. If you eat properly after the ride you can ride for days and days without problems; if you don’t you’re most likely going to be tired and out of energy by the third day.
After a period of extended exercise, like an all-day bike ride, the body is energy depleted. Stored glycogen reserves are used up and blood glucose is low. The body reacts to this situation by entering a phase during which carbohydrates are broken down, converted to glycogen and stored in muscles and the liver in an extremely efficient manner. In other words, when sustained exercise ends, the body will go into overdrive to replace what it has lost. This period of intense glycogen production and storage only lasts for about 30 minutes, however. It is absolutely essential that you feed your system carbohydrates during this 30 minute window. If you do, you will lay down a solid foundation of stored glycogen that can be built on for the rest of the day so that you are ready to ride again the following day. If you don’t, it doesn’t matter what you eat for the rest of the day; you will be building on a weak foundation and you won’t have the glycogen reserves you need to ride with strength day after day. This cannot be stressed enough; you have to reload your system with carbs during the first 30 minutes after you get off the bike.
What should you eat during this critical 30 minutes? Current thinking holds that you should aim to ingest one half gram of carbohydrate for each pound of body weight during the 30 minutes after a period of extended (more than 90 minutes) exercise. This is easy to figure out; simply divide your weight in half and eat that many grams of carbs. For example, I weigh about 160 lbs so I need to eat 80 grams of carbs within 30 minutes of getting off the bike. There is also some evidence that combining these carbs with protein facilitates the glycogen production and storage process. The recommended ratio of carbs to proteins is 4 to 1. Thus, at 160 lbs I need 80 grams of carbs and 20 grams of protein. Eating this much in 30 minutes can be very difficult. The 30 minute part is much more important than the specific amount of carbs and protein part. If you can’t manage to choke down the full recommended amount, eat as much as you can but make absolutely sure you do it in the first 30 minutes after you get off the bike.
The carb sources you’ve been eating on the bike will work equally well during this critical 30 minute window but you may be sick and tired of sports drink, energy gel, low-fat fig newtons or whatever you’ve been eating by this time. Some foods that are high in carbs and easy to have available after a ride include bagels, bananas, fruit juice, low-fat yogurt, cornflakes and muesli-type cereals. Laura and I drink a recovery drink called Endurox that contains carbs and proteins in the recommended 4 to 1 ratio. Endurox comes in a powdered form that you mix with water. Depending on where you’re riding, this can be a bit of a hassle. We usually premeasure the powder, put it in a sealed plastic bag, and carry it with us on the ride. As soon as we get off the bike we mix the powder with water and drink it. We drink the lemon-lime flavor and it’s actually pretty good; we have come to look forward to drinking it at the end of the ride.
Once you have eaten the recommended amount of carbohydrates try to continue to eat 50 to 100 grams of carbs every two hours throughout the remainder of the day. Eat small amounts steadily rather than eating nothing and then pigging out at dinner. Avoid alcohol because it will interfere with the uptake of glycogen and will also dehydrate you. This is especially important immediately after the ride when the body is in the critical glycogen restocking period.
Some additional information about carbs
Experimenting with different foods. By now the message is clear, consume carbs steadily throughout the ride and consume more carbs after the ride is over. There is a fly in the ointment, however. Too much carbohydrate in the stomach is likely to produce nausea. How much is too much? Individuals differ widely in this and so you will have to experiment to find out how much carbohydrate you can handle. Be especially careful if you mix your own sports drink from a powder. If you make too strong a mix you can make yourself sick. Another reason to experiment with eating different carbohydrate-rich foods is to discover a combination of foods and sports drinks that you like well enough to eat and drink on the bike. It doesn’t do you any good to be carrying nutritionally perfect foods if you don’t like to eat them on the bike and won’t eat them during the ride. Cyclists often repeat the mantra “Find what works for you” when discussing what to eat during and after a ride. This is good advice as long as it is understood that it doesn’t mean eat anything you like. Unless you are a member of an alien species, your biology works like all of the other humans. French fries, beer, oreos and ice cream aren’t going to provide what you need to ride even though they may “work for you”.
Carbohydrate loading. Although most people have heard of it, carbo loading is an advanced topic that is more appropriate for people who are engaged in serious competitive endurance events. The basic idea is to maximize glycogen storage at the beginning of an athletic event. This involves a careful schedule of pre-event exercise and eating that is designed to first deplete the body’s glycogen stores as much as possible and then build them up to mega-levels which are timed to peak on the day of the event. Having a huge pasta dinner the night before a long ride isn’t carbo loading, it’s overeating. Carbo loading isn’t a good strategy for multiday cycling events.
Carbohydrates and the immune system. Here’s an added side benefit of continually eating carbs during and after a ride. It will help to prevent you from getting sick. Remember that the benefit of carbohydrate is that it is broken down to glucose relatively quickly and glucose fuels both the muscles and the brain. If blood glucose level drops too low or drops precipitously your system will respond by releasing large amounts of stress hormones. One of these hormones is cortisol and athletes commonly show elevated cortisol levels after prolonged exercise. Cortisol also markedly depresses immune function. What this means is that inadequate carbohydrate supply, in addition to all of the other problems it will produce, can lead to an increased probability of infections, colds, slow healing etc. Laura and I have ridden the Washington DC AidsRide (about 350 miles in 4 days) and belong to a listserve for AidsRiders. Every year during the week after the ride there is a flurry of emails from riders reporting that they got sick when the ride was over followed by another flurry of emails wondering why this is such a common experience. Not surprising at all if you understand the many roles carbohydrates play in endurance nutrition.
Carbs and fats. Low to moderate levels of exercise carried out for long periods of time is an excellent way to burn fat and lose weight. This makes long bike rides an attractive weight loss technique for many people. It has also led to some confused thinking about the relationships between weight loss, fats and carbohydrates. Sometimes people think that they should eat as little as possible during a long ride because they want to lose weight. They reason that the less they eat, the more fat they will burn off. This is a very bad idea. First, for all the reasons discussed above, keeping blood glucose high by steadily ingesting carbohydrates is essential for a successful ride. You aren’t going to lose much weight if you bonk and quit the ride or if the ride was so miserable that you don’t get back on the bike for weeks or months. In addition, carbohydrates are used in the process by which stored fat is broken down to provide energy. This means that on long rides keeping your carbohydrate input steady will actually help you break down fat and lose weight.
In summary, the message here should be pretty clear. Carbohydrates are essential for long rides and for riding day after day. A steady stream of carbs will get you through the longest ride without bonking. Barring injury, nothing is more important for having strength and energy throughout multiday events than making sure you eat enough carbohydrate during the first 30 minutes after you get off the bike each day. Whenever we do multiday rides like the Glacier National Park tour Laura and I see riders run out of energy, stop having fun, and begin yearning for a rest day on about the third day of the ride while we have energy day after day and often ride additional miles when we have the chance. People wonder how we do this. It’s simple, we eat right.
Recent Comments