Low Carbohydrate versus Isoenergetic Balanced Diets for Reducing Weight and Cardiovascular Risk: A Systematic Review and Meta-Analysis
This systematic review and meta-analysis of 19 randomized controlled trials with over 3200 participants found little to no difference in weight loss or changes in cardiovascular risk factors (blood pressure, cholesterol, glucose) between low-carbohydrate and isoenergetic balanced diets over short-term (3-6 months) and medium-term (1-2 years) follow-up. The authors conclude that weight loss is primarily driven by overall energy deficit, not macronutrient composition, but note issues with adherence and reporting bias in many included trials.