Eco Atkins Diet Beneficial for Weight Loss and Cholesterol Levels

According to researchers, overweight individuals who ate a low-calorie, low-carbohydrate diet high in plant-based proteins for four weeks experienced weight loss and improvements in blood cholesterol levels and other heart disease risk factors. A high-carbohydrate, low-fat vegetarian diet also resulted in weight loss but without the additional cardiovascular benefits.

There is a dilemma relating to the proportion and source of fat, protein and carbohydrate that constitutes the optimal weight loss and cholesterol-lowering diet. Newer dietary approaches for the prevention and treatment of chronic disease emphasize increased fruit and vegetable intake and reduced meat consumption.

However, low-carbohydrate diets with increased meat consumption have also been promoted for weight loss and the prevention and treatment of diabetes and coronary heart disease. These diets have been shown to be effective in inducing weight loss, reducing insulin resistance, lowering blood fats known as triglycerides and raising HDL cholesterol (good cholesterol) levels, but have tended to increase LDL cholesterol (bad cholesterol) levels. "This lack of a benefit for LDL cholesterol control is a major disadvantage in using this dietary strategy in those already at increased risk of coronary heart disease," the authors write.

David J.A. Jenkins and colleagues tested the effects of a low-carbohydrate diet high in vegetable proteins from gluten, soy, nuts, fruits, vegetables, cereals and vegetable oils among overweight men and women with high LDL cholesterol levels. A total of 25 participants were randomly assigned to consume this diet, the "Eco-Atkins" diet, for four weeks, while an additional 25 participants ate a control diet that was high-carbohydrate, lacto-ovo vegetarian and based on low-fat dairy and whole grain products. Study food was provided to participants at 60 percent of their estimated calorie requirements.

Of the 47 participants who began the study, 44 (22 in each group) completed the four-week period. Weight loss was similar, about 4 kilograms or 8.8 pounds, in both groups. However, reductions in LDL cholesterol levels and improvements in the ratios between total cholesterol and HDL cholesterol were greater for the low-carbohydrate diet compared with the high-carbohydrate diet. The low-carbohydrate diet also appeared to produce beneficial changes in levels and ratios of apolipoproteins, proteins that bind to fats. In addition, small but significantly greater reductions were seen in both systolic (top number) and diastolic (bottom number) blood pressure for the low-carbohydrate vs. the high-carbohydrate group.

Pending answers to important questions, including whether further reducing carbohydrate intake would produce additional benefits, "a plant-based low-carbohydrate diet high in vegetable proteins and oils may be an effective option in treating those with dyslipidemia for whom both weight loss and lower LDL cholesterol concentrations are treatment goals," the authors conclude.

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References:
1. David J.A. Jenkins, et al. The Effect of a Plant-Based Low-Carbohydrate ("Eco-Atkins") Diet on Body Weight and Blood Lipid Concentrations in Hyperlipidemic Subjects. Arch Intern Med. 2009;169(11):1046-1054.