Adherence
When combined with comprehensive behavioral treatment, low-carbohydrate and low-fat diets produce equivalent long-term weight loss (approx. 7% at 2 years), refuting the claim that low-carb diets are superior for long-term weight loss.
If you are struggling to lose weight long-term, the specific type of diet (low-carb vs. low-fat) matters less than your ability to stick to it. This study shows that with proper behavioral support (tracking, counseling, exercise), both diets lead to similar, significant weight loss (around 7% of body weight) over two years. Focus on building sustainable habits rather than searching for a 'magic' macronutrient ratio.
We found no statistically significant differences in weight loss at any time point between the low-carbohydrate and low-fat diet groups... Successful weight loss can be achieved with either a low-fat or low-carbohydrate diet when coupled with behavioral treatment.
Why this rating
Randomized controlled trial, large sample (n=307), long duration (2 years), rigorous statistical modeling.
Source
Weight and Metabolic Outcomes After 2 Years on a Low-Carbohydrate Versus Low-Fat Diet
Gary D. Foster et al. · Annals of Internal Medicine · 2010
This is one finding among thousands. Every one is graded and traced to its source, so you can see what the evidence actually supports. Browse the research →