One problem with calorie counting is that some calories will turn to fat more than others will. Fat calories, and science has known this for a long time, turn to fat much easier, and with out working the body with the conversion, than protein or carbs.

Also most people figure out the amount of calories to eat with formulas that use weight in the equation. Well a person thats 130lbs of lean mass and 90lbs of fat doesn't need to eat the # of calories that a person thats 170lbs of lean mass and 50lbs of fat.

So basing an equation on weight doesn't makes sense.

Also you don't want to just cut a shit load of calories from your diet. Your body tries to protect its self. Even if you have 100lbs of fat your body thinks of that as its self and fights to prtect it. It develops all the adipose cells, capillaries, enzyme counts, peripheral nerves, hormone levels, and connective tissue to support it.

So then we jump on the newest biggest diet and shed pounds in a matter of hours(well almost). So the body panics and slows metabolism, increases fat storage and increases appetitie.

The trick is to do it all very slowly, don't scare your body, don't go for any crazy diets, it is abillion dollor industry(cause we keep going back-wonder why?).

Thats why people yo-yo. The diet does make them lose weight (probably partly from canabolized muscle) and you can fight your body and fight it with the crazy don't eat enough diets but its inevitable you'll jump back up.

Lose it slow, slow, slow.