The more research that is conducted about the weight loss benefits of grapefruit, the more confirmation we get about how effective it really is. It is believed that the weight loss benefits of grapefruit revolve around one of the enzymes it has that is involved in the chemical process which generated energy. When this enzyme gets activated, it influences the body’s natural processes that turn the sugars we eat in to the energy that our cells use, known as ATP. This influences weight loss by increasing metabolism, and this release of energy during exercise can also help improve muscle endurance as well. Studies conducted on animals as well show that grapefruit juice alone can be more effective than traditional weight loss prescription drugs. One study in particular compared the use of grapefruit juice to a no longer used drug called sibutramine, which was used to lose weight. Grapefruit juice was not only found to be more effective than sibutramine in reducing weight, but also didn’t come with the side effects of heart attack and stroke. Although grapefruit juice has been proven to be effective in losing weight, fresh grapefruit is the best source to get these benefits. Just half a glass of grapefruit juice was seen to help reduce weight by improving insulin resistance. Insulin resistance is a major cause of type 2 diabetes, which is a major contributor to weight gain and obesity itself. Eating grapefruits or drinking juice is definitely an effective way to lose weight.