But many in the scientific community also raise serious concerns:
* Dr. Robert Eckel of the American Heart Association says that high-protein, low-carbohydrate diets put people at risk of heart disease; A long term study published in the New England Journal of Medicine in 2006 found that women reduced heart disease risk by eating more protein and fat from vegetable sources.
* A 2001 scientific review conducted by Freedman et al. and published in the peer reviewed scientific journal Obesity Research concluded that low-carb dieters' initial advantage in weight loss was a result of increased water loss, and that after the initial period, low-carbohydrate diets produce similar fat loss to other diets with similar caloric intake.
* The May 2004 Annals of Internal Medicine study showed that Atkins Dieters had significantly more diarrhea, general weakness, rashes and muscle cramps. Atkins.com now suggests a fiber supplement.
* Consuming too much protein can create health problems and protein toxicity for patients with certain medical problems, for example those with preexisting kidney problems.