So most fitness trainers believe that the only way to make certain you were eating the "right amount" of food was to count calories. And, in some respects (like competitive bodybuilding) this is true. However, it is not just the quantity of calories that is important, it's the quality of those calories consumed that really matters for overall health. The old adage "a calorie is a calorie" isn't true. A gram of fat yields more than twice as many calories as a gram of carbohydrates or protein - that's not new. What is new is that studies now indicate that calorie for calorie, fat is more fattening (duh). In one study, two groups of people were fed the same number of calories per day but with different amounts of fat. After several months, the group that was fed a larger percent-age of the calories from fat gained more weight than the group on the lower fat diet. The explanation has to do with metabolic efficiency. Since dietary fat is already fat, i...