21 Feb 2018 --- After years of debate, a new study at the Stanford University School of Medicine has found that neither a low-fat nor a low-carb diet is superior: Cutting either carbs or fats leads to a reduction of excess weight in about the same proportion, according to the study. The study also looked into whether insulin levels or a specific genotype pattern could predict an individual's success on either diet. The answer, in both cases, was no.