In order to be fit the new season, it is important to plan your diet carefully and to make sure the plan is put into practice. If you need to lose weight (carrying too much body fat can affect your performance) you should reduce the amount of fat in your diet or foods that lead to fat. However, do not cut out fats completely. Providing enough of the right sort of fuel for exercise (carbohydrate) will help to get the most out of training sessions and help to prevent fatigue toward the end of the match.
You need carbohydrates to get you through the day whether it be to work out, train on the pitch, play a game or quite simply so your body receives the right nutrients to function properly throughout the day. Without proper carbohydrates you will feel weak, irritated and tired. Do not eliminate carbohydrates from your diet despite the bad reputation they have received over the years for losing weight and becoming lean like most professional players.