Why Most Athletes Are Undereating — and What to Do About It
Why Most Athletes Are Undereating — and What to Do About It
In 20 years of cooking for professional athletes, the most common mistake I see isn't eating the wrong foods — it's simply not eating enough. Caloric restriction, even unintentional, is one of the greatest enemies of peak athletic performance.
The Underfueling Paradox
Athletes often associate leanness with performance. And while body composition matters in many sports, the obsession with being "light" frequently leads to chronic underfueling — a state where the body is perpetually running below its energetic needs. The symptoms are subtle at first: slower recovery, nagging injuries that won't resolve, mood fluctuations, declining output despite consistent training. Chef Red Raymundo — Private
"The first question I ask any new athlete client isn't 'what are you eating?' — it's 'how much are you eating?'"
What the Numbers Tell Us
Elite endurance athletes can require 4,000–6,000+ calories per day. Even strength-focused athletes in the off-season rarely need fewer than 3,500. Yet the clients who come to me are often consuming 2,500–3,000 — a deficit of 500 to 1,000+ calories daily.
Over weeks and months, this creates what sports nutritionists call Relative Energy Deficiency in Sport (RED-S): hormonal disruption, bone density loss, suppressed immune function, and ultimately, declining performance.
The Solution: Eating for Output, Not Appearance
- Calculate your TDEE accurately. Most online calculators underestimate athletic output by 15–25%.
- Prioritize carbohydrates strategically. Around training windows, carbs are not the enemy — they are the fuel.
- Protein timing matters. 30–40g of high-quality protein within 45 minutes of training significantly improves recovery and muscle protein synthesis.
- Don't neglect fats. Omega-3s from quality sources support joint health and reduce systemic inflammation — essential for any athlete training at high volume.
When I redesign an athlete's nutrition plan, the first thing we do is bring calories up — gradually, with careful monitoring — and measure the performance impact. The results are consistently remarkable.
Frequently Asked Questions
What is the most common nutrition mistake among athletes?
The most common mistake is not eating enough, even unintentionally, leading to chronic underfueling.
What are the symptoms of chronic underfueling?
Symptoms include slower recovery, nagging injuries, mood fluctuations, and declining output despite consistent training.
What is RED-S?
RED-S stands for Relative Energy Deficiency in Sport, which includes hormonal disruption, bone density loss, suppressed immune function, and declining performance.
How many calories do elite endurance athletes need daily?
Elite endurance athletes can require 4,000–6,000+ calories per day.
What are the key nutrition strategies for athletes?
Calculate TDEE accurately, prioritize carbohydrates around training, consume 30–40g protein within 45 minutes of training, and include omega-3 fats for joint health and inflammation reduction.