what r different components of food ? explain role of vitamins in diet

Please refer the link below:
https://www.meritnation.com/ask-answer/question/what-are-the-component-of-food/components-of-food/7991239  

For role of vitamins refer the link below:
https://www.meritnation.com/ask-answer/question/there-are-how-many-types-of-vitamins/components-of-food/2110195