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Fatigue is an integral part of training. Each session represents a stress on the body that then requires a period of recovery and adaptation.
But when fatigue becomes permanent, persists despite rest, or is accompanied by a drop in performance, it may be useful to look for other explanations.
In athletes, certain nutritional deficiencies are among the factors likely to cause chronic fatigue or insufficient recovery.
Without replacing medical advice or a biological assessment when necessary, understanding the role of certain nutrients can help identify relevant areas for improvement.
When to talk about chronic fatigue?
Temporary fatigue after a period of intense training is perfectly normal.
However, when the feeling of exhaustion persists for several weeks despite adequate recovery, it becomes relevant to investigate its causes.
This fatigue can manifest in different ways:
- Lack of daily energy
- Drop in athletic performance
- Difficulty recovering
- Loss of motivation
- Constant feeling of heaviness
- Unusual drowsiness
Nutritional deficiencies are not the only possible explanations, but they are among the factors to consider.
Why are athletes concerned?
Physical activity increases the body's needs.
Repeated training puts more strain on the muscles, nervous system, energy reserves, and recovery mechanisms.
When the diet does not adequately cover these needs, certain deficiencies can gradually appear.
Athletes who undertake large training volumes, endurance disciplines, or people following restrictive diets are particularly affected.
Iron: a common deficiency
Iron is probably one of the nutrients most often associated with fatigue in athletes.
It notably participates in the transport of oxygen in the body via hemoglobin.
Insufficient reserves can be associated with:
- Persistent fatigue
- A decrease in endurance capacity
- Faster shortness of breath
- More difficult recovery
Female athletes have an increased risk of iron deficiency due to menstrual losses, which can be compounded by the demands of training.
However, any iron supplementation should be considered after an appropriate biological assessment.
Vitamin D and energy levels
Vitamin D is primarily known for its role in bone health, but it also intervenes in many physiological mechanisms.
Vitamin D insufficiency is relatively common, especially in regions with little sun exposure during certain periods of the year.
In some athletes, an insufficient status can be associated with:
- Increased fatigue
- Less effective recovery
- A decrease in certain muscle functions
A blood test remains the most reliable way to assess one's status.
Magnesium and fatigue
Magnesium participates in several hundred enzymatic reactions in the body.
It plays a role in energy metabolism, muscle function, and the functioning of the nervous system.
Insufficient intake can contribute to various symptoms:
- Fatigue
- Muscle tension
- Irritability
- Increased feeling of stress
- Difficulty recovering
Needs can be influenced by the level of physical activity and certain eating habits.
B vitamins
B vitamins are involved in many processes related to energy production.
They notably participate in the body's use of carbohydrates, lipids, and proteins.
Severe deficiencies remain relatively rare in people with a varied diet, but certain profiles may be more exposed:
- Very restrictive diets
- Poorly balanced vegan diets
- People with certain digestive conditions
Vitamin B12, in particular, deserves special attention in athletes who completely exclude animal products.
Insufficient energy intake
Fatigue does not always stem from a specific deficiency.
In many cases, the problem simply lies in insufficient energy intake relative to expenditure.
Prolonged caloric deficit can lead to:
- A decrease in available energy
- Less effective recovery
- A decrease in performance
- An increased risk of injury
This situation is frequently observed during overly aggressive weight loss phases.
Beware of overly restrictive diets
Some diets exclude entire food groups without genuine necessity.
When poorly constructed, these diets can promote the onset of nutritional deficiencies in the medium or long term.
Athletes generally benefit from maintaining a varied diet that can cover all their nutritional needs.
Dietary diversity remains one of the best tools for preventing deficiencies.
How to identify a possible deficiency?
Symptoms alone do not confirm a deficiency.
Persistent fatigue can have many origins: overtraining, lack of sleep, chronic stress, underlying pathologies, or nutritional imbalances.
When it becomes persistent, a medical and biological assessment may be necessary to precisely identify the causes.
This approach helps to avoid unnecessary or unsuitable supplementation.
What to remember
In athletes, certain nutritional deficiencies or insufficiencies can contribute to persistent fatigue and a drop in performance.
Iron, vitamin D, magnesium, certain B vitamins, and insufficient energy intake are among the most frequently implicated factors.
However, chronic fatigue is a multifactorial phenomenon that should never be reduced to a single nutritional cause.
A balanced diet, adequate recovery, quality sleep, and medical follow-up when necessary remain the best strategies for maintaining energy levels and performance over time.
