Buying fruit or vegetables that are in season is cheaper, as is buying loose produce. Frozen peas contain more vitamin C than some fresh vegetables. Tinned fruit in natural juice and vegetables, concentrated fruit juice and dried fruit contribute to your five daily portions, too. And they last longer.

The best sources are red meat and fish. Vegetarians should eat fortified cereals, dried fruit, beans and pulses.

Bread, potatoes, rice and pasta are starchy carbohydrates, which should make up a third of your diet. They are cheap - especially if bought in bulk - versatile and full of energy. Plus, they fill you up. They are also easy to cook, if you only have a two-ring hob or are fighting for space in a small kitchen.

A healthy diet is based on breads, potatoes and cereals, is rich in fruit and vegetables, and includes moderate amounts of meat or fish and limited amounts of fat or sugar. The best and freshest foods aren't always the cheapest, but students can be creative in their shopping and cooking habits.

Alcohol is a diuretic, and the pounding headaches and furry tongue are caused by dehydration, so replacing this lost water is essential.