________ are the major sources of fuel and fiber. systems. ________ provide nitrogen and function in structures throughout many boc are the components of all cells and have a role in hormone production. ________ assist other nutrients through digestion, absorption, metabolism, and excretion. ________ contribute to cellular structure and affect fluid balance, which influences muscle function and the central nervous system. ________ is the most important nutrient and we can only live a few days without it.
a. Fats
b. Water
c. Proteins
d. Minerals
e. Carbohydrates
f. Vitamins