Ice
water frozen into the solid state
Would a diet of ice eventually kill a person?
Humans can survive without water for four days. Ice can be melted into water, which consists of hydrogen and oxygen, using a simple cigarette lighter. Humans can survive without food for 30 to 40 days on average. Humans need carbohydrates, proteins, and fats that are contained in foods. Water does not contain fat, carbohydrates or protein.
Ice is the solid state of what? What nutrients are needed to sustain human life? Are most of #2 absent from #1?