U.S Researchers say a simple DNA test may predict whether someone is more likely to lose weight on a low fat or a low carbohydrate diet. The results from the small preliminary study of 101 women showed those on the best diet for their genes lost two to three times more weight than the rest. They found that those on a diet which matched their genotype lost 2-3 times more weight over 12 months compared with those on the wrong diet.<br/>