Clinical trial on low-fat vegan diet and weight loss

A 16-week randomized clinical trial published in JAMA Network Open suggests that a low-fat vegan diet can facilitate weight loss by reducing dietary energy density without requiring portion control or calorie restriction.

The study, which involved overweight adults, compared a group following an ad libitum low-fat vegan diet—primarily consisting of fruits, vegetables, grains, and legumes—against a control group maintaining their usual eating habits. While neither group was assigned specific calorie targets, the vegan group experienced a reduction in energy density of approximately 30%.

Researchers found that although the total weight of food consumed did not change significantly between groups, the vegan group consumed roughly 357 fewer calories per day. This reduction is attributed to the lower calorie content per gram of plant-based foods compared to animal products like meat, dairy, and eggs.

Further analysis of the findings suggests that food choice may be more critical for weight loss than traditional calorie counting. Hana Kahleova, MD, PhD, Director of Clinical Research at the Physicians Committee for Responsible Medicine, noted that individuals can eat more and feel full while still losing weight if they choose foods that are naturally lower in energy density.