A food is what we eat or drink.
Hunger is the signal that our body needs to be nourished with elements essential to its functioning. Eating bad causes more or less serious health problems. Fatigue, difficulty concentrating, frequent infections are signs of deficiency.

Which foods? In what proportions?
Our body needs macronutrients that are proteins, carbohydrates, lipids in a proportion varying according to the age, the sex and the activity. Proteins must provide about 15% of our calories, we find them in meat and fish, legumes, cereals. Carbohydrates account for 40 to 55% of our daily intake. We take them from vegetables, fruits and cereals. Lipids account for 28 to 38% of our energy intake. There are several families of fats. Saturated fats (butter, cheeses, sausages) to consume moderately, unsaturated fats (omega-9) and polyunsaturated fats (omega-6 and omega-3), present in vegetable oils, oily fish. Trans fats, of industrial origin, are to be limited or even avoided. It is important to manage your daily fat intake.

Foods play on mood and dynamism
By the nutrients they bring, foods have an influence on our mood. Follow this link to see which foods are good mood, as well as the essential foods in an athlete's meal.