The energy to partake in daily activities comes from our diet. The amount of energy depends on the macro-nutrient content of what we eat in terms of carbohydrates, fats and proteins. Carbohydrates provide the most energy and they can be stored as glucose in the blood or glycogen in the muscles and the liver. Fat provides stored energy.
Diet plays an important part in helping one recover in case of injury, illness or fatigue. Important issues in the recovery from sport or physical activity include restoration of liver and muscle glycogen stores and the replacement of fluids and electrolytes.
If you are overweight, eating a balanced diet can be an important, first step towards weight loss. Many people who are able to lose weight through being part of fad diets gain, the weight back when they return to their own eating habits.
Eating too much of a certain kind of food can cause you to be unable to fall asleep [such as foods with high levels of artificial sugar, like candy]. Eating heavy oily foods can cause you to have difficulty waking up in the morning. Eating a balanced diet will enable you not only to sleep better without the use of sleeping pills but also feel more rested when you wake up.