What It Is

Volumetrics is based on a basic fact: people like to eat. And if people are given the choice between eating more and eating less, they'll take more almost every time.

Unlike diets that are based on deprivation, the Volumetrics diet doesn't try to fight this natural preference. Its creator, nutritionist Barbara Rolls, PhD, argues that limiting your diet too severely won't work in the long run. You'll just wind up hungry and unhappy and go back to your old ways.

Rolls' approach is to help people find foods that they can eat lots of while still losing weight. The hook of Volumetrics is its focus on satiety, the feeling of fullness. Rolls says that people feel full because of the amount of food they eat -- not because of the number of calories or the grams of fat, protein, or carbs. So the trick is to fill up on foods that aren't full of calories. Rolls claims that in some cases, following Volumetrics will allow you to eat more -- not less -- than you do now, while still slimming down.

What It Is

"Cut Sugar to Trim Fat" proclaims the dust jacket of Sugar Busters! Inside the book, you read that "Sugar is toxic!" And that's the basic premise of the diet. The authors tell you to eliminate all sweets made with refined sugar and certain fruits and vegetables with a high-sugar content because they wreak havoc on your biochemical system. The diet also promises to lower your cholesterol, achieve optimal wellness, increase your energy, and help treat diabetes and other diseases.

So proclaims the diet that became a self-published phenomenon in New Orleans, until a major publisher released Sugar Busters! in 1998. It's still selling so strong in the hardcover edition that the paperback hasn't been released yet. The four authors are H. Leighton Steward, a former CEO, and three doctors from the Big Easy: Morrison C. Bethea, MD, a cardiothoracic surgeon; Samuel S. Andrews, MD, an endocrinologist; and Luis A. Balart, MD, a gastroenterologist.

What It Is

They may seem similar, but the South Beach diet is more than just a heart-friendly version of the Atkins diet. All the same, they have a lot in common.

Both South Beach and Atkins diets are the creation of medical doctors. The father of the South Beach diet is cardiologist Arthur Agatston, MD, director of the Mount Sinai Cardiac Prevention Center in Miami Beach, Fla.

Both the South Beach and Atkins diets are best-selling diet books. Only someone living in a cave hasn't, by now, heard of Agatston's The South Beach Diet: The Delicious, Doctor-Designed, Foolproof Plan for Fast and Healthy Weight Loss.

What It Is

The Sonoma diet. Does the phrase conjure images of plum-dark wine and succulent salmon enjoyed overlooking verdant grape vines?

If so, that may be the aim of Connie Guttersen, PhD, RD. The author of The Sonoma Diet hopes you'll see her diet plan as marrying pleasure with health, where every meal is about "celebration, not deprivation."

The secret to losing weight forever, says Guttersen, a registered dietitian and dietary consultant, is not in avoiding foods you love but enjoying the right foods in the right amounts.