New research has found little difference among various branded diets as far as results are concerned. The key is sticking to the diet.

Lead study author Bradley Johnston, assistant professor of clinical epidemiology of the Michael G. DeGroote School of Medicine at McMaster University, wanted to be the first to compare all existing trials of popular branded diets to identify whether or not they were effective at helping people lose weight.

The study involved the analysis of 48 randomized clinical trials of branded diets, with more than 7,200 overweight and obese participants. The study’s volunteers were assessed at the six- and 12-month mark. The branded diets included Weight Watchers, Atkins, The Zone, Jenny Craig, Nutrisystem, Ornish, Slimming World, Volumetrics, LEARN, Rosemary Conley, and South Beach.

Those on the low-carbohydrate diets lost 19 more pounds compared to those not on a diet after the six-month mark. After the same time period, those on the low-fat diets lost 17 more pounds compared to those not on a diet. After 12 months, there was no difference in the effectiveness between the low-carb and low-fat diets.

“Given the popularity of these diets around the world, there has been a real lack of research to examine their relative benefits. But overall, the differences between the different diets regarding their impact on weight loss were relatively small,” said Johnston in a statement.

The findings of the study are published in the Journal of the American Medical Association (JAMA).