In Health Watch:Sick of trying diets that fail?Now there may be a scientific way to find out which one will work for you .Karen Brown reports.Dieting... it can feel like running in place."I tried the insulin resistance diet once.""I tried the Meghan Fox water and vinegar diet."But now a new study...says your perfect diet ... may be found in your genes.Dr. Louis Aronne says, 'We're finally beginning to have proof that you can scientifically determine which diet if best for any given person.'Researchers at Stanford University found that a simple DNA test can predict if you will lose more weight on a low carb diet or a low fat one."Do you really think it could be that easy?I'm hoping so....I've been trying for years to get it right."Magician Kenny Brown has been overweight his entire life... he could make tissues disappear... but not the pounds.Kenny Brown says, 'I tried everything.'But when Dr. Louis Aronne determined he needed a low carb diet, the pounds started coming off.The study of 138 women found that weight loss of 40 pounds or more could be connected to several genes that regulate how fat and carbs are metabolized.Dr. Mindy Dopler Nelson says, "So they had a five times greater weight loss if they were assigned appropriately based on their genetic patterns."Another study found that 45% of white women have a low carb genotype while 39% percent have a low fat genotype.Dr. "A finding like this can help millions of people.'Kenny has now lost 60 pounds.Kenny says, "You have to stick to your willpower."Scientists say a larger study is needed... but for a country facing an obesity epidemic - it's a step in the right direction.