What Is the Volumetrics Diet and How Does It Work for Weight Loss?

The volumetrics diet offers a weight-loss strategy designed to keep men full by focusing on food volume and energy density rather than strict portion deprivation.

The 2000 Penn State Origin

Barbara Rolls, a nutrition science researcher at Penn State, originally created the volumetrics diet in 2000 and detailed the strategy in her book, The Ultimate Volumetrics Diet. Unlike traditional diets that rely on tiny portions and bland salads, the volumetrics plan encourages eating high amounts of food with the goal of filling the stomach.

Dietitians note that the plan works particularly well for men looking to lose weight because it prevents the intense hunger typically triggered by other calorie-restriction diets. The core purpose of the eating plan is to prevent overeating by keeping individuals full through nutrient-dense, high-volume foods, explains Sonya Angelone, RD, PhD, a dietitian and former spokeswoman for the Academy of Nutrition and Dietetics.

Daily Targets and Energy Density

Followers of the volumetrics diet generally target an intake of 1,400 calories per day during weight loss alongside 30 to 60 minutes of daily exercise. Rather than cutting out entire food groups, the plan introduces more liquids via soups, stews, and salads to take up physical space in the stomach.

The mechanics of the plan rely directly on the calories per gram of food, a metric known as energy density. Foods rich in water and fiber provide a larger physical volume with fewer calories, allowing followers to feel full while naturally reducing overall energy intake.

Four Categories of Calorie Density

Technically, no food is completely off-limits on the volumetrics diet. Instead, foods are grouped into four distinct categories based on their calorie density, which is calculated by dividing the number of calories per serving by its weight in grams.

Category one includes foods with a calorie density under 0.6, featuring high water content items like berries, melons, broccoli, beets, carrots, nonfat yogurt, skim milk, and broth-based soups that should make up the bulk of the diet. Category two covers foods with a calorie density of 0.7 to 1.5, to be eaten in moderation, including skinless chicken, lean beef, lentils, chickpeas, potatoes, squash, brown rice, and quinoa.

Category three contains foods with a calorie density of 1.6 to 3.9, which should be consumed in smaller amounts, such as fatty meat, fish, cheese, whole milk, pasta, and white bread. Category four lists foods with a calorie density of four to nine, designated to be eaten sparingly, including nuts, seeds, oils, fast food, and candy.

Sample Daily Meal Plan

Nutrition experts outline a typical day on the volumetrics diet starting with a vegetable omelet and a side of fresh berries or melon for breakfast. Lunch features a large arugula salad with sliced cucumbers, grated carrots, cherry tomatoes, garbanzo beans, grilled chicken, one-half cup of cooled roasted potatoes, vinegar dressing, and a cup of broth-based vegetable soup.

For an afternoon snack, followers can have plain nonfat Greek yogurt mixed with one-half cup of berries and one cup of watermelon. Dinner rounds out the day with baked cod, three-quarters of a cup of brown rice, and additional fiber-rich vegetables, maintaining the high-volume approach without sacrificing nutritional balance.