Overall, a decent carb and fat blocker, but all the ingredients used are currently at levels too low to have effects similar to what we've seen in the scholarly research on those ingredients. And they are charging a hefty price for this low quantity of ingredients. Combine this with the markeitng claim that you can eat whatever carbs you want to eat, and still NOT get fat, raises some serious question on the product. All users are different and certainly will experience different weight-loss results, but workout in combination with a healtier diet and supplements is a better approach. We recommend Instant Knockout and Phen375 over It works fat fighter. Instant Knockout has fat blocking ingredient glucomannan as well as other thermogenic ingrdients, that makes it top of the line weight loss supplement. If you are specifically looking for fiber to lose weight, we recommend Smoothie Diet.