As you need the functions of food and the nutrients they contain in the form of three primary functions, let me try that.
- The first function of the nutrients in food is to provide energy for the body. Our body cannot get its energy from any other source except the food we eat. The nutrients involved here are carbohydrates, fats and proteins
- The second function would be to create all the bodily parts and help in their repair as they are damaged with use and over time. This requires nutrients like proteins, fats, and minerals like calcium, magnesium, etc.
- The third function would be to facilitate the two functions mentioned earlier. This would be the role of all the vitamins, minerals required in very small amounts, etc.
I hope this answers your query to an extent.