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Food is an essential source of substances that make up the human body. The main components of the body are water (59%), followed by proteins (18%), fats (18%), minerals (4.3%), and less than 1% carbohydrates. Water is distributed differently across tissues. Proteins are found in muscles and internal organs. Fats are stored under the skin, in the liver, and in the blood. Carbohydrates are mainly stored in the liver and muscles.

Calcium and phosphorus play a key role in the structure of bones and teeth, while sodium and chloride are found in body fluids. Potassium is essential for muscles, and magnesium is present in all body tissues. A balanced diet is crucial to maintain health, as the balance of nutrients is important for the proper functioning of the body.

Energy production requires the oxidation of sugar and fat. Breakfast is especially important as it determines energy levels for the day. Foods like milk and cheese are rich in protein but contain little sugar. Vitamins and other nutrients are necessary for the body to function properly.