Several professionals, such as Dr. Michael Tremba of Natural Weight Loss Truth, recommend the Beyond diet. However, nutrition experts that include Kathleen Zelman of WebMD and Katherine Tallmadge of the American Dietetic Association claim that the weight-loss program is founded on spurious, unscientific advice that is potentially dangerous.
The Beyond diet is based on the premise of matching foods to an individual's distinctive metabolic type, notes Natural Weight Loss Truth. According to Isabel De Los Rios, developer of the Beyond diet and Diet Solutions weight-loss programs, people fall into one of the three metabolic groups; protein, carb or a mix of the two.
According to this point of view, individuals with, for instance, a carb metabolic type, can eat large quantities of processed carbohydrates without gaining weight, reports WebMD, citing Rios. In short, weight loss is the product of eating foods that match a particular metabolic type.
However, while professionals such as Dr. Michael Tremba back the program, a number of nutrition experts deride it. For instance, David Schardt of the Center for Science in the Public Interest disputes both the claims made by the developers of the program and the certifications of Rios. Nutritionist and American Dietetic Association spokeswoman Katherine Tallmadge also takes issue with Rios' qualifications, and adds that she is not licensed to practice her craft. In addition, Tallmadge points out that Rios relies on information that is not derived from peer-reviewed scientific journals.