In the traditional sense, this question can not be adequately answered. A versatile diet is a healthy diet. No food alone provides all the basic nutrients that the body needs. Above all, vegetable foods, such as fruits, vegetables and cereals are classified as healthy foods. These foods contain important fiber, Vitamins, minerals and carbohydrates. In addition to herbal products, the body needs proteins that it receives from eating animal foods. Animal foods should contain a small amount of fat and be supplied to the body in moderation. On the side of vegetable foods, attention must be paid to the dosage of oils and fats. Excessive consumption is unhealthy for the human body. 
An intake of at least 1.5 liters in adults is part of a healthy diet.