There are six essential nutrients that each person should incorporate in their daily diet. These include water, carbohydrates, fruits and vegetables, protein, dairy products, and fats. Water, ironically, is the nutrient that people name last, but it is the most important nutrient in terms of our survival. If we abstain from all six nutrients, we will die first from dehydration. Water is involved in maintaining a safe pH(acid/base) balance and many metabolic functions.