How Much Dietary Fat Should Athletes Eat? A Sports Dietitian Explains

Fat is essential for student athletes’ health and performance — but more isn’t better. Athletes should get roughly 20–35% of daily calories from fat, prioritizing healthy sources like avocados, olive oil, nuts, and fatty fish, while keeping fat low in pre-game and pre-training meals. Too much fat crowds out the carbohydrates and protein athletes need most.

While all macronutrients — carbohydrates, protein, and fat — play important roles in fueling the body, the balance among them is crucial. As sports nutritionists, we see many athletes trying to gain weight lean too heavily on fat to hit their calorie goals. Here’s why that backfires, and how to get fat intake right.

1. Too Much Fat Crowds Out Carbs and Protein

One of the primary concerns with consuming too much fat is caloric balance. Fat is calorie-dense, providing 9 calories per gram compared to 4 calories per gram for both carbohydrates and protein. While fat is an essential part of any diet, an excess can quickly push your caloric intake beyond what your activity level requires — leading to increased body fat instead of lean muscle mass.

For athletes, meeting specific calorie goals is essential for optimal performance, recovery, and body composition. But when a large portion of those calories comes from fat, it leaves less room for the two macronutrients doing the heavy lifting:

• Carbohydrates are the body’s preferred energy source, especially during high-intensity exercise. Insufficient carb intake depletes glycogen stores, resulting in fatigue, reduced endurance, and impaired performance.
• Protein is vital for muscle repair, growth, and recovery. If too many calories are allocated to fat, athletes may not consume enough protein to support these processes — leading to muscle breakdown and slower recovery. See Wendi’s muscle-building protein tip sheet on Instagram HERE.

By prioritizing carbohydrates and protein, athletes get the fuel they need to perform at their best while still including healthy fats in moderation.

2. High-Fat Meals Digest Slowly and Leave Athletes Sluggish

Fat takes longer to break down in the digestive system than carbohydrates and protein. That slow digestion can leave athletes feeling heavy and lethargic — especially when a high-fat meal or snack is eaten before a training session or game. See the Nutrition with Wendi Instagram post on swapping regular PB for PB2!

Nutrient timing is everything for athletes. The goal before activity is quick, easily accessible energy. High-fat meals sit in the stomach longer, making athletes feel weighed down rather than energized and ready to perform.

3. Excess Fat Intake Affects Body Composition and Speed

Athletes often work toward an optimal body composition for their sport — building muscle, losing fat, or maintaining a certain weight. Excess fat intake can lead to unwanted weight gain that hurts speed, agility, and endurance.

And while fat is an important energy reserve, relying too heavily on fat for fuel shifts the body away from glycogen (stored carbohydrate), which is far more efficient during high-intensity activity. That’s especially detrimental in sports built on quick bursts of energy — sprinting, basketball, football, hockey, and soccer.

Healthy Fats vs. Unhealthy Fats for Athletes

Dietary fat is necessary for overall health — supporting hormone production, nutrient absorption, and brain function. But the source matters:

• Limit: Saturated and trans fats found in fried foods, baked goods, and processed snacks. These can increase heart disease risk and inflammation — particularly concerning for athletes who put their bodies under stress regularly.
• Prioritize: Healthy fats from avocados, nuts, seeds, olive oil, and fatty fish like salmon. These support overall health and athletic performance when consumed in appropriate amounts.

The key is moderation — making sure these fats don’t crowd out other important nutrients. To learn more about oils, check out our seed oils blog!

How Much Fat Do Athletes Need? 5 Practical Tips

To maintain the right macronutrient balance, athletes should:

1. Prioritize carbohydrates as the primary energy source, especially around training and competition.
2. Ensure adequate protein intake to support muscle repair and growth.
3. Include healthy fats in moderation — avocados, olive oil, nuts, and fatty fish.
4. Watch portion sizes on high-fat foods to avoid exceeding calorie needs. (Remember: 2 tbsp of peanut butter is roughly 190 calories — it adds up fast.)
5. Time your fat intake. Keep meals and snacks lower-fat before activity to avoid sluggishness and digestive discomfort, and after activity to speed muscle recovery and repair.

Female Athletes: Eating Too LITTLE Fat Is Also a Problem

While some athletes overdo fat, we see the opposite problem far too often in female athletes — chronically under-eating fat in an effort to stay lean. This is just as damaging to health and performance, and here’s why:

Dietary fat is essential for hormone production, including estrogen and progesterone. When female athletes restrict fat too severely — especially combined with high training volume — hormone health suffers. Consequences can include:

• Irregular or missing periods (amenorrhea) — losing your period is a warning sign of low energy availability, not proof you’re training hard. Tips on how to regain your cycle and how to spot disordered eating. 
• Reduced bone density — low estrogen impairs bone building during the exact years young female athletes should be banking bone mass, raising the risk of stress fractures now and osteoporosis later.
• Fatigue, poor recovery, and stalled performance — hormones drive muscle repair, energy metabolism, and adaptation to training.
• Increased injury risk — under-fueled athletes get hurt more often and take longer to heal. The Wendi Irlbeck Show Episode 18 covers female athletes.

The fix isn’t complicated: female athletes should include healthy fats at meals daily — avocado, olive oil, nuts, seeds, nut butters, fatty fish, and full-fat dairy all fit. Fat is not the enemy of a lean, strong physique; it’s a requirement for the hormones that build one. For more on fueling around your cycle, see Wendi’s menstrual cycle nutrition guidance on Instagram.

Parents and coaches: if a female athlete in your life has lost her period, is constantly fatigued, or is dealing with recurring injuries, her fueling needs attention. My Fuel Her Potential: Female Athlete Fueling Guide walks athletes, parents, coaches, and trainers through exactly how to fuel the female athlete for hormone health, recovery, and performance.

FAQ: Fat Intake for Athletes

How much fat should an athlete eat per day? Most athletes do well getting roughly 20–35% of total daily calories from fat, with the remainder prioritized toward carbohydrates and protein. Individual needs vary based on body weight, sport, training phase, and goals — a sports dietitian can dial in your exact targets.

Is fat bad for athletes? No — fat is essential for hormone production, nutrient absorption, and brain function. The problem is excess fat intake, which crowds out carbs and protein, slows digestion before activity, and can lead to unwanted body fat.

Should athletes eat fat before a game or workout? Keep pre-activity meals and snacks low in fat. High-fat foods digest slowly and can leave you feeling heavy and sluggish during competition. Save healthy fats for meals further from training and game time.

What are the best healthy fats for athletes? Avocados, olive oil, nuts, seeds, and fatty fish like salmon. These provide omega-3s and support recovery, hormone health, and inflammation management.

Can eating too little fat affect female athletes’ hormones? Yes. Dietary fat is required to produce estrogen and progesterone. Female athletes who chronically under-eat fat can experience irregular or missing periods, reduced bone density, fatigue, and higher injury risk. Healthy fats at every meal support hormone health and performance.

Need more help? Grab the Fuel Her Potential: The Female Athlete Fueling Guide

Why do athletes trying to gain weight overeat fat? Fat is calorie-dense (9 calories per gram), so it’s an easy way to hit calorie goals — but it often displaces the carbohydrates and protein needed to build lean muscle instead of body fat. Weight gain plans should be built around carbs and protein first.

The Bottom Line

By understanding the role of fat and balancing it with carbohydrates and protein, athletes can optimize performance, support recovery, and maintain healthy body composition. Fat isn’t the enemy — imbalance is.

Many young athletes struggle with gaining weight, and most of the time it’s because they aren’t eating enough of the right things. We remove the guesswork for health and performance nutrition guidance so you can stress less and perform better!