Food is food; so when does it become junk food? When its primarily composed of empty calorie fatty concoctions, sugary items, salt laced junk foods, processed foodstuffs, and chemically altered food selections. Fast foods slow down metabolisms because fat is stored in over sized cells inducing weight gains. We speed up metabolisms by cool demeanors, exercise, water, fruits, vegetables, complex carbohydrates, and quality proteins. Sped up bodily metabolisms naturally promote energetic, sleek, stealthy, and healthy bodies.