The brain doesn't need carbs to feed it. However, it is maybe wired to make us want them. The best way to stop wanting carbs is to eat as few of them as you can. If you are into the science of all this, there are some interesting threads on this Forum. If you just want to lose weight and feel OK ditto. This Forum caters for anyone interested in following a low carb way of eating. I wish you all the best.