What makes up a balanced diet, what does each nutrient do, and how should diet change for an active performer?
The components of a balanced diet (carbohydrates, fats, proteins, vitamins, minerals, fibre and water), the function of each, energy balance and its link to body weight, the importance of hydration, and how diet is adapted for performance.
A focused CCEA GCSE Physical Education answer on diet and nutrition, covering the components of a balanced diet and their functions, energy balance and body weight, hydration, and how a performer adapts diet for training and competition.
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What this dot point is asking
CCEA wants you to know the components of a balanced diet, the function of each nutrient, what energy balance means and how it links to body weight, why hydration matters, and how a performer adapts their diet for training and competition. Diet is a lifestyle decision that directly affects health and performance, so this topic links to fitness and to the effects of exercise.
The components of a balanced diet
A balanced diet is not just about eating enough; it is about eating the right proportions of each group for your needs. An active person needs more energy, so a larger share of carbohydrate, while someone trying to build muscle needs enough protein.
Energy balance and body weight
Energy balance decides whether body weight stays the same, rises or falls:
| Situation | What happens | Effect on weight |
|---|---|---|
| Energy in = energy out | Energy balance | Weight stays the same |
| Energy in greater than energy out | Excess stored as fat | Weight increases (risk of obesity) |
| Energy in less than energy out | Body uses fat stores | Weight decreases |
A sports performer must take in enough energy to train and compete, but not so much that they gain unwanted fat. This is why diet links to a healthy body weight and to the risks of a sedentary lifestyle.
Hydration
Water is lost as sweat during exercise, and even a small loss reduces performance.
To stay hydrated a performer should drink before, during and after activity, especially in heat. CCEA expects you to link dehydration to a clear drop in performance.
Adapting diet for performance
Different activities need different diets. CCEA expects simple, applied points:
- Endurance athletes (for example a marathon runner) eat extra carbohydrate, sometimes carbohydrate loading in the days before an event, to fill the energy stores.
- Power and strength athletes (for example a weightlifter) need enough protein for muscle growth and repair, alongside energy for training.
- All performers need good hydration and enough vitamins and minerals, for example iron for oxygen transport and calcium for strong bones.
Examples in context
Example 1. A marathon runner's race-week diet. In the days before a marathon, the runner eats more carbohydrate to top up the energy stores in the muscles, drinks plenty to start the race well hydrated, and keeps protein for recovery. This shows diet being adapted to the demands of a long endurance event, exactly the application CCEA rewards.
Example 2. Energy balance over a season. A rugby player who keeps eating large festive meals once training stops will take in more energy than they use, store the excess as fat and gain weight, making them slower. Matching energy in to energy out keeps weight and performance steady, which is why energy balance is part of a healthy diet.
Try this
Q1. State the main function of carbohydrate and of protein in the diet. [2 marks]
- Cue. Carbohydrate is the main and quickest energy source; protein is for the growth and repair of muscle.
Q2. Explain what is meant by energy balance. [2 marks]
- Cue. Energy taken in from food equals energy used by the body, so body weight stays the same.
Exam-style practice questions
Practice questions written in the style of CCEA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
CCEA 2022 Paper 14 marksName two nutrients found in a balanced diet and state the function of each for a sports performer.Show worked answer →
One mark for naming each nutrient and one for its function (up to two nutrients).
Carbohydrates: the body's main and quickest source of energy, fuelling exercise; vital for an endurance runner who needs sustained energy.
Proteins: needed for the growth and repair of muscle tissue, important for a weightlifter building and repairing muscle.
Fats: a slow-release energy store and insulation, useful as an energy source in long, low-intensity exercise.
Markers reward any two nutrients (carbohydrate, fat, protein, vitamins, minerals, fibre, water) each with a correct function. A common error is to name a food (for example "pasta") instead of a nutrient.
CCEA 2023 Paper 16 marksEvaluate the importance of energy balance and hydration for a games player's diet.Show worked answer →
Up to three marks for energy balance and up to three for hydration, rewarding the point and its link to performance and health.
Energy balance: energy balance is when energy taken in from food equals energy used. If a player eats more than they use the excess is stored as fat and weight rises; if they eat less than they use they lose weight. A games player needs enough energy to train and play but not so much that they gain unwanted weight.
Hydration: water makes up most of the body and is lost in sweat during a match. Dehydration thickens the blood, raises heart rate, causes cramp and tiredness and reduces concentration, so the player must drink before, during and after play.
Evaluation: both matter, but their importance shifts with the activity; for a long match in heat, hydration is critical to avoid early fatigue, while over a season energy balance protects healthy weight and consistent performance.
Markers reward a clear definition of energy balance, the effects of dehydration, application to the player, and an evaluative judgement.
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