01-05-2016, 13:00
You may never. FG doesn't work for everyone. Honestly, it seems to work only for a few. If you're just trying things randomly the rule of thumb is to give it a month unless you experience side effects you can't live with. FG shouldn't mess up anything major at the very least, the only real side effects most ever experience are cravings, sweat odor, and insulin spikes.