Science Does Not Support Low-Fat Diets

By Mark Lange, PhD

A systematic review [i] published in The Lancet Diabetes & Endocrinology looked at 53 randomized trials comparing the effectiveness of low-fat diets to other diets for long-term (≥ 1 year) weight loss. The research found that low-fat interventions were no more successful than higher-fat interventions in achieving and maintaining weight loss for periods longer than one year. The research team leader, Dr. Deidre Tobias, states that “Despite the pervasive dogma that one needs to cut fat from their diet in order to lose weight, the existing scientific evidence does not support low-fat diets over other dietary interventions for long-term weight loss.” In fact, it was found that low-carbohydrate interventions led to significantly greater weight loss than did low-fat interventions.

[i] Tobias, D. K., et al.  Effect of low fat diet interventions versus other diet interventions on long -term weight change in adults: a systematic review and meta-analysis.  DOI: