How Many Calories Do Runners Really Need?

Several factors go into being able to improve your performance as a runner. Consistent training with the right mix of speed work, long runs, and easy runs are at the top of the list. Rest and cross training must also be incorporated to recover properly and be prepared for the hard sessions to come. Nutrition plays a large role in performance, as it is what gives us the energy we need to actually perform and to do it well. Consuming the proper amount of carbohydrates and proteins is the key to sustaining energy levels while making sure to include other key nutrients like iron and vitamins.

You may have been in the situation where you do well during training for a bit but frequently struggle to hit several workouts in a row. This is usually a sign that you are not eating enough. As volume and intensity increases during training cycles, the number of calories your body requires increases as well. Even if you are on top of your nutrition game, it is easy to not meet your recommended calorie intake. Not eating enough calories can leave you fatigued on every run and increase your injury risk. But what is the right amount?

Calorie Intake

The right amount of calories a runner requires will depend on age, sex, weight, and activity level. This means it may be necessary to consume a fluctuating amount each day of the week since the intensity and length of runs and other workouts vary. The recommended daily calorie intake for a sedentary adult male ranges from 2200 to 2600 calories. For females, the range is 1800 to 2000 calories. Therefore some distance runners may need close to 3000 or more calories most days of the week to maintain their weight and energy levels. This may seem like too much, especially to women, but it is what is necessary if you want to perform your best and not risk getting injured.

Weight Loss & Training

If you currently are overweight or obese, then a lower calorie intake is ideal until you reach your goal weight. This should be done carefully, as cutting calories too low can result in limited energy. This will only lead to having to skip workouts and not be able to run your hardest. Having too little calories may also lead to muscle loss, which is what powers us through our workouts. Therefore if weight loss is a goal when training for a race, then it should be done gradually. Unfortunately, it is safest to plan an extremely slow weight loss of about a half pound per week.

Calorie Requirements Equation

Although calorie calculators you find online are used to get an estimate of the number of calories you need, it is usually in the ballpark of the right amount. The Harris-Benedict equation is a popular formula used to estimate your needs and takes into account your current activity level.

BMR for Men:    (10 x weight in kg) + (6.25 x height in cm) – (5 x age in years) + 5

BMR for Women: (10 x weight in kg) + (6.25 x height in cm) – (5 x age in years) – 161

BMR is your basal metabolic rate, which is the number of calories your body requires in order to function properly. Once you calculate your BMR with this formula, you can multiply by the different values according to daily activity level.

For men and women:

Sedentary/little to no extra activity: BMR x 1.2

Light exercise 1-3x/week: BMR x 1.375

Moderate activity 3-5 days/week: BMR x 1.55

Very active 6-7 days/week: BMR x 1.725

Hard exercise/physical job (2x/day training): BMR x 1.9

This method is a good way to determine how many calories you should have on each training day, since some runners train twice a day a few times per week, but take a full rest day as well. Calorie requirements will be very different for each of these days.

Even with the above formula, the calorie requirement calculation can be wrong—either too high or too low. Everybody is different and some runners burn more calories per hour than others. Fitness levels, genetics, and present medical conditions can impact your calorie-burning rate. A more accurate test is one where you sit for ten minutes with a mask over your face and your breathing is measured to determine how much oxygen you use at rest. Whether you use this method or the formula above, many times it is all about trial and error. It is best for runners to eat more than they think they need at first and see how their body responds rather than under eating to see if it is good enough. You do not want to risk getting injured or wasting too many weeks not making progress due to not eating enough.

Types of Calories

Once you understand your individual daily calorie requirements, then it is important to fuel your body with the right types of calories. Limiting “empty calories” is key as these are considered calories with no nutritional value. Most packaged snacks, candy, soda, and chips are in this category. Runners should focus on getting the majority of their calories, at least 60%, from high-quality carbohydrates in order to supply the muscles with enough glycogen. The other 40% can be divided evenly between lean proteins and healthy fats. Proper fueling and hydration practices are necessary for performance improvement, injury prevention, and for an overall healthy body.

Sources

Benjamin I. Rapoport , Metabolic Factors Limiting Performance in Marathon Runners, Journal, Dec 26, 2019.

The Role of Glutamine in Recovery

Whether you are an elite athlete or a recreational runner training for long distances, you are at risk for developing overtraining syndrome and other ailments. Marathon training requires us to engage in multiple strenuous training sessions several days out of the week. More advanced runners train somewhat intensely every day! Prolonged and intense exercise can increase the risk of muscle tissue damage, inflammation, cardiac dysfunction, decreased immune function, and overuse injuries. PHEW! That’s quite a list of negatives, but don’t be fooled—there is a way to avoid all of these!

When deciding what type of marathon training plan is right for you, it is important to know that all plans can be modified based on your needs. Some athletes require more rest and recovery days than others. There is a reason that these easy days are scattered throughout the training weeks in every plan. It is meant to decrease the risk of developing the negative side effects of too much running.

There are important vitamins and nutrients athletes specifically need in order to stay healthy. Although a good balanced diet, preferably higher in quality calories, may be enough to obtain all of these essential nutrients, sometimes supplementation is necessary. Getting in everything we need for a balanced diet is difficult to do day in and day out, especially if you have a busy schedule to begin with. Many athletes supplement their diets with extra protein, usually in the form of powder. The reason for this is that protein is crucially important for the health of muscles, bones, skin, cartilage, and blood in the body. When deciding which protein powder to use, it is best to choose one that includes the important amino acids, which are the building blocks of the protein we need in order to function.

Glutamine

One extremely essential amino acid that gets depleted with hard training is glutamine. The depletion is said to likely be from the demand for glutamine from different organs exceeding the supply in the body after exercise. The role of this essential amino acid in the body is to assist with protein synthesis to build stronger muscles, support the immune system, and for the enhancement of hydration in the body. After strenuous exercise, the depletion of glutamine can last up to six days, which can greatly affect the recovery process of muscle damage. The low state of this essential amino acid is also what causes athletes to be more susceptible to illness, such as colds and the flu, following hard training. Glutamine may also be depleted with other conditions such as trauma, burns, muscular dystrophy, and any other conditions causing stress in the body.

Muscle Repair

Muscle tissue damage is almost inevitable in athletes. The breakdown of muscle, causing tiny tears, is what builds strength. But this strength is only built during the recovery and healing process. This means that your muscles aren’t actually getting bigger and stronger while you are weight lifting—it all happens when you begin your rest period. Of course, nutrition will also play an important role in these strength gains. It is always a good idea to eat after a workout, especially after a strenuous run. A carbohydrate and protein-rich meal or snack is ideal, since this will help speed up the recovery process. As mentioned above, choosing a protein powder that includes the essential amino acids as part of a recovery shake is a good option to replenish the possibly lost glutamine. Glutamine alone also comes in the form of capsules, so this may be a quicker option for some athletes.

Immune Function

Glutamine is essential to immune function as it assists with lymphocyte proliferation and the production of cytokines. What does this mean? Well, lymphocyte proliferation is basically cell production and cytokines are molecules the immune system needs in order to communicate when there is infection, inflammation, or trauma. Without these processes, immunity is weak and cannot properly fight against bacteria. Studies have shown that the inclusion of glutamine following surgery, medical procedures, and trauma, especially in patients with a compromised immune system, resulted in lower levels of infection and shorter hospital stays. In the case of endurance athletes, studies have concluded that there have been less episodes of illness following strenuous training or races with the intake of a glutamine supplement.

Muscle Hydration

Glutamine assists in the absorption of water and other nutrients to keep our muscle tissues hydrated properly. Prolonged and intense exercise causes extreme stress and dehydration throughout the body. Glutamine supplementation has been shown to improve the hydration process by way of enhancing electrolyte and fluid absorption in the muscles. It may be beneficial to opt for electrolyte drinks that contain this nutrient and other branched-chain amino acids, usually labeled “BCAAs”.

If you are a runner looking to increase your training time and improve your performance, it is extremely important to pay attention to your diet. Many people have the thought that since they are exercising so much they can eat whatever they want and not worry about nutrition. Yes, the body will burn a load of calories with the hard workouts, but it will only impede strength gains and performance improvements if the body is not taking in the nutrients and vitamins it needs to repair and build. With all of the calories burned, essential nutrition gets depleted as well. This will only lead to fatigue, illness, and/or injury. The best way to get as many of these important nutrients from your diet is to make sure you are getting in enough quality carbs, protein, and fats from nutrient-rich foods such as veggies, fruits, and whole grains.

Sources

Vinicius Fernandes Cruzat, Maurício Krause and Philip Newsholme, Amino Acid Supplementation and Impact on Immune Function in the Context of Exercise, Journal, Oct 28, 2019

Rohde T, MacLean DA, Pedersen BK., Effect of Glutamine Supplementation on Changes in the Immune System Induced by Repeated Exercise., Journal, Oct 28, 2019

Boelens PG, Nijveldt RJ, Houdijk AP, Meijer S, van Leeuwen PA., Glutamine Alimentation in Catabolic State, Journal, Oct 28, 2019

Vitamins: Do Athletes Really Need More?

Diet and exercise go hand in hand these days. Most people change their diets when they begin an exercise program, or at the least, they become more mindful of what they eat and drink. Whether you are exercising to lose weight, gain muscle, train for a marathon, or simply to maintain a healthy heart, diet will play a big role in the outcomes. Many active people include supplements in their diet to get more nutrients that may be missing in their regular diets or for the sake of enhancing their performance or recovery. The best approach to nutrition is to eat a well-balanced diet from every food group, making sure to include all vitamins and minerals your body needs. For the majority of people who live a busy lifestyle, this may not always be possible.

In any popluation many factors can affect what the body needs such as illness and disease, regular diet, activity level, genetics, and even the amount of time we spend indoors versus outdoors! People who lower their food intake to lose weight end up lacking necessary nutrients the body needs. On the other spectrum, high intensity athletes, especially marathoners, tend to lose nutrients and not replace them sufficiently due to their higher metabolic rates. Both of these categories require a certain amount of nutrients, including vitamins and minerals in order for the body to perform at any state and maintain proper organ function.

Since many vitamin and mineral supplement bottles are labeled with a notice that states they are not FDA approved, many people are opposed to taking them. It isn’t until they develop a symptom or certain results from routine blood work that they pay more attention to taking the essential missing nutrients. It would be helpful to get evaluated by your doctor and get routine blood work done before any negative symptoms or illness develop, since it is possible that a body can naturally not produce or absorb certain nutrients even when given a wholesome diet. If you are trying to lose weight and know that you are cutting out certain food groups, or are an athlete performing at higher intensity levels or for long durations, you may want to consider including proper supplementation to keep your body going.

Calcium and Vitamin D

Bone health is a popular topic throughout life. Most children are brought up learning to drink calcium-rich milk every day to make and keep bones strong. Besides being a bone-strengthener, calcium is also in charge of other vital roles in our bodies such as nerve conduction, muscle contraction, and aiding in blood clotting. Many food sources are rich in calcium besides milk, including almonds, kale, broccoli, yogurt, and most other dairy products. Sufficient amounts of Vitamin D should also be included as it is responsible for the calcium absorption, as well as other functions such as helping reduce inflammation in the body and for immune health. More recent studies have shown that insufficient Vitamin D intake may lead to more incidences of stress fractures and decreased performance levels. Foods high in Vitamin D include milk, mushrooms, eggs, and most seafood. The easiest way to increase vitamin D intake is to spend an extra ten minutes in the sunlight!

Iron and Vitamin C

The most important role iron plays in the body is to transport oxygen in the blood to the tissues, basically ensuring proper muscle function. This is a major factor for athletes who want to perform at their best. During recovery from strenuous exercise, such as long distance running, iron helps produce new cells and repair our damaged muscles. It is important for high intensity and endurance athletes to include the recommended amount of iron in their diets. Women in particular should be aware that their requirements are higher than for men. Iron deficiency can be caused by blood loss, poor absorption, or inadequate intake through diet. The antioxidant Vitamin C plays a role in the proper absorption of iron, as long as it is ingested at the same time. Vitamin C is also vital for the repair of damaged tissue and immune health.

B Vitamins

For active individuals who train at high intensities or for prolonged periods, it is essential to include the recommended amount of B-vitamins in order to be able to perform at their best. This important group of substances is in charge of the proper metabolism of macronutrients—carbohydrates, proteins, and fats. Some B-vitamins help our bodies rely on carbohydrates for energy, which may assist in delaying the glycogen depletion process. This is desirable for a marathon runner who wants sustained energy for as long as possible. These vitamins are abundant in many food sources, so it is not difficult to ensure adequate intake. Fortified cereals, vegetables, lentils, animal products, and nuts are all rich in most B-vitamins.

Magnesium

Many vitamins, minerals, and antioxidants aide in the metabolism of macronutrients, including magnesium, which is essential for muscle health. Its role in protein synthesis is especially important for the recovery process when muscle tissue is broken down during exercise. Magnesium also plays a role in oxygen uptake, therefore making it beneficial for high intensity and prolonged exercise, since there is a need for higher oxygen requirements. During activities that result in increased sweat loss, magnesium is known to be one of the electrolytes lost during the process, which will decline exercise performance if not replaced. Good high-magnesium food sources include seeds, legumes, bananas, avocados, and dark chocolate.

Upper Intake Level

Although dietary requirements of vitamins and minerals vary from one individual to another, it is important to note that there is a maximum. Many studies have shown there are benefits to including the proper amount of vitamins in an athlete’s diet, but going beyond the maximum level will not enhance performance further. There are harmful effects of ingesting too much of any nutrient, such as increased risk of toxicity, interference in absorption of other medications and nutrients, immunosuppression and oxidative damage. As mentioned earlier, it is best to include a balanced diet of all food groups in your daily diet with plenty of fruits, vegetables, and other fortified sources before opting for supplementation. If your diet is lacking in a particular food group, such as in a vegan or vegetarian diet, or a low calorie diet used for weight loss, and it is difficult to include a variety of vitamin-rich food sources, supplementation may be necessary. Many health conditions and diseases can alter the amount of nutrients and vitamins our bodies require, which is why it is always best to consult a medical professional before modifying your diet.

Sources

Melvin H. Williams, Dietary Supplements and Sports Performance: Introduction and Vitamins, Journal, Nov 03, 2017

John Eric W. Smith, Megan E. Holmes, Matthew J. McAllister, Nutritional Considerations for Performance in Young Athletes, Journal, Nov 03, 2017

Kathleen Woolf, Melinda M. Manore, B-vitamins and Exercise: Does Exercise Alter Requirements?, Journal, Nov 03, 2017

Forrest H. Nielsen and Henry C. Lukaski, Update on the Relationship Between Magnesium and Exercise, Journal, Nov 03, 2017