Some info relating to what I was saying earlier...
Increasing thyroid function can have a dramatic effect on body composition. An example, people with overactive thyroids(hyperthyroidism) can often eat 5000 calories or more and remain rail thin. Conversely people with underactive thyroids(hypothyroidism) may only eat 1000 calories and remain obese.
Supplements that increase thyroid function are the minerals manganese, zinc, chromium, potassium, selenium and iodine. The vitamins B1, B6, B12, folic acid, C, and E, also increase thyroid function.
Boosting adrenal medulla function will also help one lose excess fat. This is the part that produces the catecholamines norepinephrine and epinephrine, which are similar in function to caffeine and ephedrine in fat-loss supplements.
Supplements that boost adrenal medulla function are calcium, iron, sodium, TMG, and tyrosine. If you're already sufficient in adrenal medulla function, over-production will result in anxiety, overstimulation, anger, and insomnia.
This is an oversimplification of the process, as there are other factors relating to fat loss. None the less, thyroid and adrenal function are important players.