Low-carbohydrate diets.
Americans spend dollar 33 billion annually on weight loss products and services, and a large portion of this money is spent on low-carbohydrate diets. Because of their higher protein and fat content and lower fiber and carbohydrate content, concerns have been raised about the potential health consequences of low-carbohydrate diets. Published long-term data are lacking. Short-term studies comparing traditional low-fat diets with low-carbohydrate diets found lower triglyceride levels, higher high-density lipoprotein cholesterol levels, similar low-density lipoprotein cholesterol levels, and lower A1C levels in persons on low-carbohydrate diets. These diets induce greater weight loss at three and six months than traditional low-fat diets; however, by one year there is no significant difference in maintained weight loss. Weight loss is directly related to calorie content and the ability to maintain caloric restriction; the proportions of nutrients in the diet are irrelevant. Low-carbohydrate diets had lower dropout rates than low-fat diets in several studies, possibly because of the high protein content and low glycemic index, which can be appetite suppressing. Data indicate that low-carbohydrate diets are a safe, reasonable alternative to low-fat diets for weight loss. Additional studies are needed to investigate the long-term safety and effectiveness of these and other approaches to weight loss.
Last
Allen R
AR
Department of Family and Community Medicine, Medical College of Wisconsin, Racine Family Medicine Residency Program, Racine, Wisconsin 53403, USA. alast@mcw.edu
Wilson
Stephen A
SA
D050528:Diet, Carbohydrate-Restricted; D004038:Diet, Reducing; D038321:Glycemic Index; D006801:Humans; D009765:Obesity / Q000178:diet therapy* / Q000517:prevention & control; D012449:Safety; D016896:Treatment Outcome; D015431:Weight Loss