Before embarking on their weight-loss journeys, the subjects took a glucose tolerance test to see whether, according to previous research, they should have a particularly strong response to a low-carb diet. They also took a DNA test to place them into one of three categories: those who carried a cluster of gene variants known to make them more sensitive to dietary fats; those who are genetically more sensitive to carbohydrates; and those who have none of the diet-related genetic variations researchers tested for.

Source: Los Angeles Times February 21, 2018 01:30 UTC