Food, Calories, and Chess Performance

This article is an improved version of a first article written two years ago.
During that time, more experience with tournaments, nutrition, and training habits has been accumulated.
Some ideas have been refined, others have been corrected, and practical observations have been added.

Chess is often perceived as a purely mental activity.
However, the body plays a crucial role in sustaining concentration during long tournaments.
Energy management is strongly influenced by food intake, calorie balance, and physical activity.
When nutrition is handled correctly, focus is maintained for several hours of demanding games.
In competitive chess, fatigue, brain fog, or sudden drops in concentration are frequently experienced.
In many cases, poor nutrition and hydration are involved.
Proper food choices provide stable energy, support mental endurance, and help maintain a healthy body weight over time.

Why Nutrition Matters in Chess

During a tournament, a large amount of energy is consumed by the brain.
Long games, deep calculation, and psychological pressure place continuous demands on cognitive resources.
Glucose becomes the primary fuel used by the brain.
When blood sugar fluctuates too strongly, concentration declines and mistakes become more frequent.
Stable nutrition provides several advantages:

• sustained mental clarity during long games
• reduced fatigue during multi-round tournaments
• improved emotional stability under pressure
• better recovery between rounds

When calories and nutrients are managed properly, the body supports the brain instead of slowing it down.

Understanding Energy Balance and Calorie Tracking

For serious chess players who want to optimize both health and performance, calorie awareness becomes extremely useful. Energy intake and energy expenditure determine whether body weight increases, decreases, or remains stable.
Several components form the total daily energy expenditure.

BMR — Basal Metabolic Rate

The Basal Metabolic Rate (BMR) represents the number of calories burned by the body at rest. Vital functions such as breathing, circulation, and brain activity consume energy continuously. Even without physical activity, the body requires a significant amount of calories every day.

NEAT — Non-Exercise Activity Thermogenesis

NEAT includes all calories burned through everyday movement outside of structured exercise. Walking, standing, moving around the house, or traveling to tournaments all contribute to this component.
Steps tracked with a smartwatch or phone often provide a useful approximation of NEAT activity. Players who walk frequently during tournaments or between rounds burn noticeably more calories.

EAT — Exercise Activity Thermogenesis

EAT refers to calories burned during deliberate exercise. Gym sessions, running, cycling, or strength training fall into this category.
Although chess itself is not physically intense, regular training sessions significantly influence total energy expenditure.

TEF — Thermic Effect of Food

TEF represents the calories used by the body to digest and process food. Proteins, carbohydrates, and fats all require energy to be absorbed and metabolized.
This component generally accounts for roughly 10% of total calorie intake.

Practical Calorie Tracking

Energy balance can be estimated and adjusted through simple practical methods.
Food is tracked by weighing ingredients using a kitchen scale. This method produces accurate calorie measurements and prevents underestimation.
Meals are logged in a nutrition tracking application. Over time, a clear picture of daily calorie intake is obtained.
Daily steps are also tracked. Steps provide a rough but useful indicator of daily movement and NEAT expenditure. When steps increase significantly during tournament travel or long walking days, energy expenditure also rises.
By combining:

• calorie tracking from weighed food
• step tracking
• exercise tracking

an approximate maintenance calorie level can be determined.
Maintenance calories represent the amount of food required to keep body weight stable.

Energy Strategy During Chess Tournaments

During periods without competition, some players may prefer to maintain a small calorie deficit in order to improve body composition.
However, during tournament periods the strategy changes.
The objective becomes energy stability, not weight loss.
Being close to energy maintenance or even in a slight calorie surplus often improves:

• concentration during long games
• mental endurance late in tournaments
• recovery between rounds

Insufficient calories often produce fatigue, irritability, and reduced calculation strength. For competitive events, stable energy availability supports consistent performance.

The Day Before the Tournament: Carbohydrate Preparation

The day before a tournament is often used to prepare the body for the effort of the following day.
Carbohydrates are emphasized because glycogen reserves are replenished through them.
These reserves serve as an accessible energy source for the brain and the body.
Foods such as pasta, rice, potatoes, or other carbohydrate-rich meals are typically included.
Two principles are respected.
First, enjoyable foods are allowed.
Satisfaction and comfort reduce stress before competition.
Mental readiness is improved when meals remain pleasant.
Second, balance is maintained.
Proteins and healthy fats (not seed oils, but red meat fats) are combined with carbohydrates.
This combination slows digestion and prevents sudden energy crashes.
Calories remain within normal limits.
Overeating produces sluggishness and gradually leads to weight gain.
Maintaining a consistent calorie intake allows stable body composition across many tournaments.

The Power of NEAT in Chess Performance

Among all components of energy expenditure, NEAT (Non-Exercise Activity Thermogenesis) is often the most underestimated. Yet it is also the most flexible and easily adjustable part of daily energy expenditure.
NEAT includes all movements that are not formal exercise:

• walking
• standing
• moving between rooms
• fidgeting
• traveling to tournaments
• pacing while thinking during games
• small body movements during concentration

Unlike structured training sessions, NEAT changes dramatically from one day to another.
For athletes of any discipline, NEAT is extremely modifiable. A simple increase in daily movement can significantly raise total daily calorie expenditure. The same principle applies to individuals who do not practice sports. Even without training sessions, NEAT can represent a large part of daily calorie burn.
A person walking 12 000–15 000 steps per day often burns hundreds of calories more than someone walking only 3 000–4 000 steps. Over time, this difference strongly influences maintenance calories.

NEAT During Chess Tournaments

During chess tournaments, NEAT becomes particularly important.
Although chess is a mental discipline, players rarely remain perfectly still for hours. Many subtle movements occur naturally:

• standing up between moves
• walking around the playing hall
• pacing while calculating
• stretching during difficult positions
• moving between rounds
• exploring the tournament venue

All these movements increase energy expenditure. Long tournament days often include several hours of low-intensity movement.
Because of this, maintenance calories during tournaments are often higher than expected. When food intake does not adapt to this increased energy demand, fatigue accumulates more quickly.

NEAT and the Importance of Calorie Balance

Energy balance becomes critical during competitive events.
If calorie intake is too low while NEAT remains high, a deficit is created. When this deficit becomes too large, the brain begins to experience reduced energy availability.
The result is familiar to many chess players:

• sudden drops in concentration
• difficulty calculating variations
• irritability or impatience
• slower thinking
• loss of mental clarity

This phenomenon is commonly described as brain fog.

Brain Fog and Caloric Deficit

Brain fog is often interpreted as stress, poor preparation, or lack of sleep. In reality, nutrition frequently plays a major role.
When a significant calorie deficit is present, several effects occur:

• glucose availability decreases
• cognitive endurance declines
• attention becomes unstable

During games, this creates the sensation that the brain suddenly disconnects.
Players sometimes experience moments where calculation becomes impossible. Variations that normally appear clearly cannot be visualized. Concentration drops unexpectedly during critical moments of the game.
These “mental holes” are frequently linked to insufficient energy intake.
The brain requires a continuous supply of energy. When food intake does not match expenditure — especially when NEAT and tournament stress increase energy demands — cognitive performance suffers.

Practical Implication for Chess Players

For this reason, energy balance becomes extremely important during tournament periods.
Instead of maintaining a calorie deficit, the objective should be:

• maintenance calories
• or a slight caloric surplus

This strategy supports stable brain function and sustained concentration.
Because NEAT can vary significantly from day to day, tracking steps and monitoring food intake becomes useful. When daily movement increases during tournaments, food intake can be adjusted accordingly.
In this way, the brain receives enough energy to function at full capacity during the most demanding games.

Tournament Day: Controlled Energy

On the day of the tournament, meals are organized around clarity and endurance.
Food remains light and balanced, avoiding both hunger and heaviness.

Morning Nutrition

Fiber-rich foods are preferred in the morning because energy is released slowly.
Examples include:

• oatmeal
• lentils
• beans
• dishes containing legumes

A practical preparation may include:

• 40 grams of oatmeal
• boiling water in a 1:2 ratio
• mixed until a solid texture is obtained

Frozen fruit may be added in quantities between 150 and 300 grams. If fruit is unavailable, approximately 130 to 180 grams of banana may be used instead.
Slow glucose release is produced by such meals. Blood sugar spikes are avoided, allowing concentration to remain stable throughout the morning.

Evening Carbohydrates Before Games

Carbohydrates are sometimes consumed later in the day before important rounds.
Energy availability is ensured when the most demanding games occur.
Large meals early in the day often create heaviness and excessive calorie intake.
By shifting carbohydrates toward the evening, energy remains available while calorie balance stays controlled.
Mental endurance during critical rounds is therefore supported.

Hydration and Smart Snacking

Hydration is a fundamental factor in chess performance.
Even mild dehydration reduces cognitive efficiency.
Reaction time slows, accuracy declines, and fatigue appears more rapidly.
Regular water consumption keeps the mind sharper during long games.
If hunger appears between rounds, light snacks are preferred. Examples include:

• a handful of nuts
• lean protein sources
• small balanced snacks

These foods prevent hunger while avoiding digestive heaviness.

Calories, Body Weight, and Long-Term Performance

Calorie control plays an important role in overall health and long-term chess performance.
When nutrition is combined with regular physical activity, body weight can be managed progressively.
A healthier body often produces greater endurance during multi-day tournaments.
One example illustrates this principle clearly.
Through careful calorie control and improved eating habits, body weight was reduced from 115 kg to 79 kg at a height of 1.84 meters.
This transformation occurred while energy levels remained sufficient for competitive chess tournaments.
A long-term calorie deficit was maintained while performance remained stable.

The Role of Physical Activity

Although chess is a mental discipline, physical fitness strongly supports performance.
Regular exercise improves:

• blood circulation
• oxygen supply to the brain
• stress regulation
• mental resilience

Players who combine good nutrition with consistent exercise often maintain concentration longer during tournaments.
Even moderate activities such as walking, light cardio, or strength training support cognitive performance.

Practical Takeaways for Chess Players

Several simple habits improve energy levels during tournaments.

1. Carbohydrates are consumed the day before competition.
2. Meals remain balanced with proteins and healthy fats.
3. Breakfast includes fiber-rich foods for slow energy release.
4. Hydration is maintained throughout the day.
5. Snacks remain light and controlled.
6. Calories are tracked to understand personal energy needs.
7. Tournament phases are played at maintenance calories or slight surplus.
8. Regular physical activity supports stamina and mental clarity.

Train Your Chess the Right Way

Nutrition helps the brain function properly, but chess improvement also depends on training structure. Many players want to improve, yet their study time becomes chaotic.
Random chess videos are watched online. Different ideas are mixed together. Confusion is slowly created, and chess understanding becomes weaker instead of stronger.

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