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Of all the sciences, nutrition may have more to offer the athletes than any of the others
Choosing the appropriate foods in suitable amounts at the correct time will not compensate for the lack of natural ability, a reluctance to undertake the require training, nor an absence of tactical awareness.
However it is equally clear a poor diet can affect an athlete’s potential to train and compete.
A good diet will not turn a mediocre athlete into a champion, but a poor diet can turn a champion into a mediocre athlete.
Preparation for competition:

An athlete’s goal at a competition is to perform to an optimal level and a range of factors can impair performance and this includes NUTRITION.

Common nutritional factors, which are associated with a decline in performance, include: depletion of glycogen in active muscles, dehydration and gastro intestinal discomfort.
Athletes should set aside 24-36hrs from the last training session to the competition to normalise food stores, eating meals which are high in carbohydrate (low GI foods) and low in fat. Athletes should normally try to drink up to two litres of water a day; this is especially important during the week leading up to the competition, so the risk of dehydration is minimised.
Pre-event meal (night before the competition): Aim to top up glycogen stores.

The pre-event meal should be high in carbohydrate and low in fat: Ideas are, pasta with low fat sauce, rice, sandwiches or rolls or jacket potatoes and beans

Avoid foods, which are high in salt, fried food especially take away’s, and foods which the athlete is not used to.

Try to consume plenty of fluids the evening before the competition, maybe with the meal. Try o drink squashes, milk or fruit juices and avoid caffeine-containing drinks, which can lead to dehydration the evening before the competition.

Pre-event meal (day of the competition)
After an eight hour fast breakfast is the most important meal before a competition. Cereals are high in carbohydrate, quick and easy, iron rich calcium rich and low in fat and cholesterol. Avoiding breakfast will lead to depleted glycogen stores and the increased risk of fatigue!

Other alternatives include:
Bagels, English muffins, spread whole-wheat toast with jam and fresh fruits. And include with fresh fruit juice or squash to maintain adequate hydration.

Pre-event meal (4hrs before the competition)
This should be eaten largely for comfort and for confidence!
Eat foods, which the athlete is used to and comfortable with, don’t try anything new before a competition, practice first before a intense training session.

It should also aim to re-fuel and rehydrate -  

Carbohydrate Rich, low in fat and fibre
Low GI- release energy slowly
Try to aim to drink 300-600ml with the pre-event meal and then 150-300ml of fluid up to the event, or try to take sips of fluid on a regular basis, but beware you can drink too much whilst waiting for the competition!

(Monitor urine colour and volume for hydration checks - should be pale in colour. Urine, which is dark yellow/brown colour and small in volume, is a sign of dehydration!)

Include carbohydrate rich foods and drinks - Ideas:
Plain breakfast cereal with low fat milk and fruit
Porridge with low fat milk and fruit juice
Toast, Muffins and crumpets with jam or honey
Baked beans on toast
Spaghetti and low fat bolognaise sauce
Jacket potato and beans
Low fat breakfast bar and a banana
Roll or sandwich with a low fat filling
Fresh fruit salad with low fat yoghurt
Nutrition after exercise
Immediate carbohydrate intake will help to increase the restoration of the glycogen stores after exercise (approx 1-1.5g of carbohydrate per kg of body weight should be aimed to be consumed immediately after exercise and then 7-10g per kg of body mass over the next 24hrs).
This is especially important if competing the next day or training.

There is the ‘open window’ effect: for 30min after training or competition, this is the time where the replacement of glycogen is at its maximum.

For glycogen replacement after exercise focus on foods, which are rich in carbohydrate especially high GI foods.

For hydration after the even, try not to rely on thirst, this is already a sign of dehydration. Drinks, which ‘you like the taste of’, will more readily promote hydration. Try not to drink plain water, if so; include a pinch of salt, which will promote the uptake of water. Avoid caffeine-containing drinks.

After a competition,  try to consume one of the following which provides approximately 50gms of carbohydrate:

2-3 medium pieces of fruit
1 round of honey or jam sandwiches
1 large mars bar
2 cereal bars
Baked potato with beans
Bowl of breakfast cereal with milk
150g thick crust pizza