a force is work being applied to an object. the force of gravity is work being applied to you by gravity, it is what keeps you on earth. Thus, gravity is essentially pushing us down to earth and this...
over = junk food and no balanced diet, no exercise, positive family history, genes, etc
under = no balanced diet, chronic illness, anorexia nervosa, etc
Over nutrition is when you eat too many calories and under nutrition is when you don't eat enough. Malnutrition means you're eating enough calories but aren't getting the right amounts of required...