answer:I eat 5 times a day, 3 meals, 2 snacks, the snacks have to be ⅓ the consumption of my meals based on the Zone Diet of blocks. Each block is an example pertaining to the value of protein, fat, and carbs – not calories. Calories give you an estimate of total food value, but your body reacts differently to each of those variables mentioned. Too much carbs makes you sluggish, too much protein in the long run can cause renal damage, and too much fat, of course, can damage arteries. However, a balance between the three places you in “The Zone” of metabolic burning, awareness, activity, and energy. Here is a link to purchase. You can buy used. The book is quite interesting, although old, I used it while deployed in Afghanistan. Couple this with exercise and plenty of water and you will be on your way to weight loss in a safe manner.