fast – v. to eat no food for a period of time

convert – v. to change (something) into a different form or so that it can be used in a different way — usually + to or into : The cells absorb light and convert it to energy.

neurons – n. a cell that carries messages between the brain and other parts of the body and that is the basic unit of the nervous system

snack – n. a small amount of food eaten between meals

positive – adj. good or useful

nonconsecutive – adj. not being in a sequence : not consecutive : Exercise three times a week on nonconsecutive days.

mood – n. the way someone feels : a person's emotional state : moody – adj. having moods that change often moodiness – n.