fundamentally weight is an issue of mass balance. simple physics. however, mass balance is somewhat hard to manage. you drink a 16 ounce glass of water, zero calories. you will weigh one more pound until you urinate it out. similar with food but even harder. you eat a pound of twinkies or a pound of roast beef you weigh a pound more. however, some of this is undigestable and you crap it out. some of the oxygen that we breath in is exhaled as an extra carbon. some nitrogen etc, goes out in urine. so what does the body usually retain out of all of this once water equilibrium and bowel movements normalized - energy that which is not consumed is stored. if you restrict the caloric intake enough, weight will fall, but as Beersk says, food is good. (and so is beer) i am not a weight nazi by any means, and i don't even push one food type over another. i tell most of my patients that i don't care what they eat, just eat less. better to enjoy less than be miserable with nothing.