Despite what infomercials and spam emails may say, there are no diets that can help someone completely control and stop unwanted hair growth. There is simply no credible evidence from any recognized medical or scientific establishment that proves a diet can tell your body to grow long hair on your head but not to grow any hair on your legs.

Diet and Unwanted Hair
A healthy diet can help control unwanted hair growth in only one circumstance. If the hair growth is in an overweight female and due to excessive testosterone from polycystic ovarian syndrome, following a healthy diet and losing weight may help reduce the severity of the unwanted hair. However, it will not necessarily solve the problem. It just helps balance hormone levels in your body, making hair slightly thinner and lighter while slowing down growth.

The only other way your diet can possibly affect unwanted hair growth is if you maintain such a poor diet that you lack the essential nutrients to grow healthy hair anywhere on your body. However, this method also means your body will lack the essential nutrients to stay healthy and maintain all other regular bodily functions and is never recommended.
Controlling Unwanted Hair Temporarily

Temporary methods for controlling unwanted hair include plucking with tweezers or threads, shaving with a razor, trimming with scissors, dissolving with a depilatory and pulling with wax or sugar solutions. There are also prescription medications that can help reduce unwanted hair growth, but they cannot stop the growth. These medications only work temporarily and the effects wear off if you stop using the medicine.

Shaving and trimming only last a short time since the root is still in place and the hair is simply cut even with the skin. Dissolving the hair lasts a moderate amount of time because it destroys some of the hair below the skin’s surface. Plucking and pulling last the longest amount of time because they remove the hair and root.
Controlling Unwanted Hair Permanently
Electrolysis and laser hair removal are the only two legal and evidence-backed methods to permanently remove unwanted hair. Both methods usually take several sessions to permanently clear an area of unwanted hair. Electrolysis is a long and potentially painful process where each individual strand of unwanted hair is connected to an electrical current that kills the follicle.

Laser removal is a quick and slightly painful process where a laser is placed over a small patch of skin. The laser is attracted to the pigment in dark hair, helping destroy the follicle. However, laser removal only works on dark hair growing from light skin. The method will not work on light hair or dark skin