about his diet. People who do heavy physical work need more food than people of mental work.
It is impossible to work out mathematically what each person must eat, but it is important to know that a diet must consist of enough of proteins, carbohydrates, fats, minerals, water and vitamins. All this you can find in fish, meat, liver, kidneys, cheese, eggs, milk, sugar, bread, potatoes, beans, green pease, butter and nuts.
Important factors of health of the digestive system are: exercise, well balanced diet, some glasses of water daily, regularity of meals and freedom from hurry and worry.
If a person is fat then a low caloric diet is given. The person takes less fat, carbohydrate and protein but plenty of green vegetables and fruit.