Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Become a Member

Get access to more than 30 brands, premium video, exclusive content, events, mapping, and more.

Already have an account? Sign In

Brands

Race Fueling

5 Myths About Protein Intake for Endurance Athletes

We examine some of the myths around protein intake for endurance athletes.

For access to all of our training, gear, and race coverage, plus exclusive training plans, FinisherPix photos, event discounts, and GPS apps, sign up for Outside+.

Protein intake for endurance athletes can play a huge role in training and recovery. But do you know everything you need to about protein intake? 

Like training for a triathlon, dietary protein is not something to take lightly. Protein is essential for a wide range of bodily processes, most notably the synthesis and maintenance of muscles, enzymes, hormones, bones, cartilage, hair, and skin. Plus, protein helps dull hunger, preventing surreptitious midnight fridge raids, and provides another fuel source for athletes to be used alongside fat and carbohydrate.

So, if all you focus on is carbohydrates, your body won’t function to its full potential, yet there remains considerable confusion about protein intake for endurance athletes, which may leave you with no idea how best to approach this macronutrient. Let’s set the record straight.

RELATED: Triathlete’s Complete Guide to Nutrition and Fueling

Myth #1: Only Bodybuilders Need More Protein

To encourage recovery of mile-ravaged muscle, improve strength, help meet increased caloric requirements, and offset protein oxidation during bouts of training, triathletes undeniably require higher protein intake than someone who only runs to the fridge during halftime. Those undergoing endurance training need about 0.55 to 0.65 grams of protein per pound of body weight. So a 160-pound triathlete needs to eat roughly 88 to 104 grams of protein per day to meet training needs. Understanding (and implementing) this protein intake for endurance athletes is significant.

As intensity, frequency, and duration of training increases shoot for the higher end of the protein range. Skimp on this, and your body will borrow from muscle to meet its needs—undermining fitness growth. Fortunately, you should have no trouble meeting your protein intake if you nosh on a varied, whole-food diet (see an example below).

Protein Power

Here’s the daily breakdown of protein intake for an endurance athlete who weighs 160 pounds:

Food Protein (g)
2 hard-boiled eggs 12
6 ounces Atlantic salmon 34
1 cup cooked quinoa 8
1 cup cooked lentils 18
1 ounce almonds 6
1/2 cup low-fat cottage cheese 14
1 cup fat-free milk 8
1 cup cooked oatmeal 8
Total protein 106

Myth #2: Protein Plays No Role In Replacing Spent Carbohydrate Stores

The power of protein post-exercise doesn’t stop with building lean body mass. Studies have demonstrated that consuming a combination of carbohydrates and protein early during the post-workout period enhances muscular glycogen levels (the storage form of carbohydrate) above what is incurred if only carbohydrates are sent down the gullet.

It’s believed that protein stimulates a larger rise in insulin levels, which helps drive more sugar into muscle cells to build more glycogen. Having saturated glycogen stores is vital to performance, since this is the primary fuel used for high-intensity exercise. Studies suggest that the ideal ratio of carbs and protein in a post-exercise meal is roughly 4:1. So, after a hard run, top that plate of pasta with some meat sauce.

RELATED: What is the Right Balance of Carbs, Fat and Protein?

Myth #3: Only Protein From Animals Is Complete

The protein that is found in a hunk of steak is made up of a chain of amino acids, 12 of which can be manufactured by the human body. Another nine, called “essential amino acids,” must be obtained from food because the body is unable to make them from other substances. A complete protein is a protein source that contains all of the essential amino acids and does a better job at repairing and building muscle cells damaged through exercise than an incomplete protein source, which lacks one or more of the key amino acids.

Steak lovers like to trumpet protein from animal sources such as beef, chicken, eggs, and milk as the only real way to get enough complete protein to meet muscular needs. But on top of providing serious nutritional firepower, the plant foods soy, quinoa, hemp, spirulina, chia, and amaranth do contain a full complement of amino acids, making them a worthy addition to any post-run repast.

Plant foods that are incomplete and need a little help, such as brown rice, beans, nuts, and lentils, can be paired together at a meal to form complete proteins. Examples are beans and rice, lentils and corn, and nut butter on whole-grain bread. Whether you are a vegan or meat eater, as long as you consume a varied diet you should have no problem consuming enough high-quality protein to meet your training needs.

RELATED: Go Beyond Tofu With These Plant-Based Proteins

Myth #4: Protein ‘Megadosing’ Maximizes Muscular Benefit

A watershed study in the Journal of the American Dietetic Association determined that the ingestion of more than 30 grams of protein (about 113 grams of lean beef) in a single meal does not further boost the stimulation of muscle protein synthesis in both young and elderly people. Excess protein will be lost to oxidation (at the expense of fat stores) or potentially converted to fat stores.

Yes, like carbohydrates, too much protein can pad your midriff with doughy flesh. The upshot is that it’s wise to spread protein intake for endurance athletes throughout the day to maximize muscle repair and synthesis instead of loading up during one or two meals.

Myth #5: Protein Powders Are A Must-Have Supplement For Athletes

Those tubs of protein powder do have their merits, particularly fast-digesting whey, which has a very high protein quality score, but it’s very much possible to hit the right protein intake for endurance athletes from food alone.

For example, a post-run smoothie that contains a half-cup Greek yogurt, 1 cup fat-free milk and two tablespoons peanut butter without any powder supplement has about 25 grams of protein. According to a 2009 study in the American Journal of Clinical Nutrition, 20 grams of protein post-workout is the magic number to stimulate muscle recovery and synthesis.

RELATED: Everything Endurance Athletes need To Know About Protein Powder