allie gorman has the details. is this true? >> it depends on who you ask. this is the test, you can buy it online. researchers use it to test your dna to find the diet best for your body. not everyone is sold on the science. >> why do some people have an easier time getting lean or building muscle? >> it's a question many ask especially if you struggle with your weight. >> i can't get rid of these five or ten pounds. >> sweets is a big issue for me. >> what about your genes? >> there is a lot of great research that exist. >> dr. dan reardan is head of a dna testing company that aims to answer the question. for $250, you can buy a testing kit. they spit into a test tube, mix it with a preservative and mail it to the fitness gene laboratory and scientists then test 48 variations. >> if the goal is getting fit or losing weight, we can guide people using their dna as a background. >> for dustin, it confirmed things he suspected. he has a tendency to gain weight but responds well to exercise. somsome results are confusing ad cancel each other out such as his res