What is the main function of protein for a performer?

The functions of carbohydrate, fat and protein, carbohydrate for health and performance, protein for strength athletes, and the glycaemic index with high-, medium- and low-GI foods.

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Key term

How are foods graded by glycaemic index, and when should high- and low-GI foods be eaten?

Key term

What is the main function of carbohydrate for a performer?

Key term

What is the main function of fat for a performer?

Questions from this subtopic

Each one with the model answer underneath.

1
What is the main function of carbohydrate for a performer?
Model answer
Carbohydrate is the main fuel for moderate and high-intensity exercise. It is stored as glycogen in muscles and the liver.
2
What is the main function of fat for a performer?
Model answer
Fat is the main fuel for low-intensity, long-duration exercise. Fat also insulates and protects organs.
3
What is the main function of protein for a performer?
Model answer
Protein builds and repairs muscle tissue. It is used for energy only when other stores run low.
4
How do carbohydrate needs differ between health and performance?
Model answer
Everyone needs carbohydrate for daily energy. Endurance performers need much more to fill their glycogen stores.
5
Why do strength athletes need more protein?
Model answer
Heavy training damages muscle fibres. Extra protein supports repair and growth.
6
What is the glycaemic index?
Model answer
The glycaemic index ranks carbohydrate foods by how quickly they raise blood glucose. High-GI foods raise it quickly.

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