What is food? What is its significance for the vital activity of the human body?

Food makes your body work, grow and repair itself. The food you eat can affect the efficiency of these processes. Food is actually one of the most complex collections of chemicals imaginable.

Food is made up of many different chemicals – macronutrients (essential nutrients that are present in relatively large amounts, such as protein), micronutrients (essential nutrients that are present in relatively small amounts, such as vitamins), water, and dietary fiber. Many other ingredients can also be found in food.