Eating right for Sports and Mental health by Nutritionist Oliver McCabe Select Stores Dalkey

Carbohydrates should make up the major part of your diet, accounting for two-thirds of the calories they consume.
The type of carbohydrate is as important as the amount. Some carbohydrates, such as sugar, are ‘fast releasing’, which means they raise your blood sugar levels quickly.
This leads to a sudden boost of energy and after a massive energy slump too, not great for studying or training.
Others, such as oats, are ‘slow releasing’. This leads to longer bouts of energy and memory.