You Often Hear the Phrase,"You Are What You Eat

You often hear the phrase,"You are what you eat." Which statement is true?

A) The food we eat provides the fundamental material to keep our bodies functioning
B) Eating fats will make you fat because your body cannot digest fats
C) The carbohydrates that you eat will cause your body to retain water,making you look bloated
D) If you eat a lot of protein,your hair and nails will grow faster