Study Finds a Diet Allowing Larger Portions Outperforms Weight Watchers Over Time

A new study has found that a diet focused on eating larger volumes of low-energy-dense foods produced more durable weight loss than the Weight Watchers program over a 12-month follow-up period. Researchers say the approach, sometimes called volume eating, allows participants to feel satisfied while consuming fewer calories overall.

How the two diets were compared

The trial randomly assigned participants to either a structured Weight Watchers plan or a volume-eating program that emphasized vegetables, fruits, broth-based soups, lean proteins, and whole grains. Both groups received the same level of counseling and calorie guidance was not strictly enforced in the volume-eating arm.

By the end of the year, participants in the volume-eating group had lost modestly more weight on average and were more likely to stick with the plan. Researchers attributed the difference to greater meal satisfaction and easier day-to-day adherence.

Why portion size may matter more than restriction

The study adds to a growing body of evidence suggesting that the energy density of food, rather than portion size alone, plays a central role in appetite control. Foods with high water and fiber content can fill the stomach without adding large numbers of calories, potentially reducing the urge to snack between meals.

• Volume eating prioritizes foods that weigh more on the plate but add fewer calories per gram.
• Structured commercial programs like Weight Watchers rely on a points system that caps total daily intake.
• Adherence, not just calorie math, appears to drive long-term outcomes in both approaches.

For readers exploring protein-focused strategies, this protein-packed smoothie recipe is reported to promote hours of fullness. Those curious about how partners handle differing diets may find the idea of a food divorce worth considering. It is also worth reviewing signs you may be eating too much protein before adjusting any eating plan.