Low-fat vegan diet cuts calories and promotes weight loss without portion restriction
A 16-week trial found that adults on an ad libitum low-fat vegan diet ate roughly the same amount of food but consumed about 357 fewer calories per day, leading to weight loss.
In a randomized clinical trial lasting 16 weeks, adults with overweight were assigned either an unrestricted low-fat vegan diet or a control diet with no changes. The vegan group ate comparable food weights to the control group but saw their energy density drop by approximately 30%, which translated into an average daily intake reduction of about 357 calories. No participants were instructed to count calories or limit portions.
The study, published in JAMA Network Open, showed that participants who achieved larger declines in energy density also experienced more pronounced weight loss, even after accounting for overall calorie changes. Hana Kahleova, the study’s lead author, highlighted that plant-based foods rich in water and fiber enable satiety while naturally lowering caloric intake. The findings suggest a dietary strategy that focuses on food composition rather than portion control for sustainable weight management.
Why it matters
The study offers a practical alternative to calorie counting for weight loss by emphasizing low-energy-density plant foods.
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