Food contains nutrients which play specific roles in the body. But is that all? The effect of nutrients such as proteins, fats, carbohydrates, and their implications for human health have been the subject of numerous studies over the years. The goodness or the benefits of a food and its impact on health cannot be determined on the basis of the individual nutrients it contains. Rather, the food must be evaluated together with other foods eaten at the same time. Carrots are rich in Vitamin A but they don't have just Vitamin A, and not all the goodness of Vitamin A is exhibited.