One gram of fat produces 9 calories (kcal), compared to 4 kcal from protein or carbohydrate.

Although becoming overweight is mostly a Detox Slim result of the body storing energy as fat because there is an excess of it, sometimes hormonal problems or an underlying medical condition may affect metabolism.

will eventually have an effect.
However, determining what your body's energy needs are, and then adapting your lifestyle according to that, will have a much faster effect on your bodyweight.
http://www.nutritionofhealth.com/detox-slim/