"In the short term, the low-carb diets are effective -- we see weight loss, improvement in some metabolic functions such as blood pressure, loss of body fat, but their real hazard is that they are nutritionally poor," she says. "They are low in calcium, low in vitamins C and A, low in fiber. We don't know if taking a vitamin-mineral supplement is adequate. There are a lot of micronutrients in foods that are not in supplements, including some we don't even know about yet. We do not have any long-term studies on these alternative diets with the extreme modifications of a nutritionally balanced diet."
Susan B. Roberts, PhD, a professor of nutrition and psychiatry at Tufts University in Boston, Ma., and co-author of Feeding Your Child for Lifelong Health, does not recommend the diet because there is no good evidence that low-carbohydrate diets work any more effectively than conventional ones. Furthermore, she says, "Because they cut back on foods that have multiple health benefits, they may reduce health in the long term."
Roberts notes that the Protein Power regimen may work for many, but the reason is different from the theory put forth in the book. It simply may be the lack of variety that works to reduce overall calorie intake. "Protein Power and most other popular diet books substantially reduce the variety of foods you are allowed to eat -- and variety itself is a major promoter of overeating," she says.
Food For Thought
As with any of the currently popular low-carbohydrate and high-protein diets, the Protein Power plan yields weight loss on the short term. However, the established nutritional community warns that these eating plans can be seriously deficient in important nutrients. While this plan does offer a range of sample diets and menus, it requires a reduction in the variety of foods that one can eat, which may be difficult to sustain over the long term.
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