Atkins diet 'is beneficial and twice as effective as rivals'

The controversial Atkins diet, which severely restricts carbohydrates in favour of unlimited amounts of fat and protein, is twice as effective as conventional diets at shedding excess pounds, new research has shown.

In a six-month trial, volunteers following the regime lost twice as much weight as those on more traditional low-calorie, high-carbohydrate diets.

And despite fears that the bestselling diet could be harmful in the long term, researchers found that the diet protected against heart disease by increasing levels of "good" cholesterol.

Full article: telegraph.co.uk

Hepatic de novo lipogenesis in normoinsulinemic and hyperinsulinemic subjects consuming high-fat, low-carbohydrate and low-fat, high-carbohydrate isoenergetic diets

"Compared with baseline, consumption of the high-fat, low-carbohydrate diet did not affect triacylglycerol concentrations. However, after the low-fat, high-carbohydrate diet, triacylglycerols increased significantly and DNL was 5–6-fold higher than in normoinsulinemic subjects consuming a high-fat diet. The increase in triacylglycerol after the low-fat, high-carbohydrate diet was correlated with fractional DNL (P < 0.01), indicating that subjects with high DNL had the greatest increase in triacylglycerols.

Conclusions: These results support the concept that both hyperinsulinemia and a low-fat diet increase DNL, and that DNL contributes to hypertriglyceridemia."

American Journal of Clinical Nutrition, Vol. 77, No. 1, 43-50, January 2003

Full article: American Journal of Clinical Nutrition

Effects of dietary fructose on plasma lipids

Effects of dietary fructose on plasma lipids in healthy subjects1,2,3

John P Bantle, Susan K Raatz, William Thomas and Angeliki Georgopoulos

1 From the Department of Medicine, the General Clinical Research Center, the Division of Biostatistics, and the School of Public Health, the University of Minnesota, Minneapolis, and the Veterans Administration Medical Center, Minneapolis.

Background: About 9% of average dietary energy intake in the United States comes from fructose. Such a high consumption raises concern about the metabolic effects of this sugar.

Objective: The objective of this study was to determine the effect of dietary fructose on plasma lipids.

Design: The study was conducted in the General Clinical Research Center at Fairview-University of Minnesota Medical Center. The participants were 24 healthy adult volunteers (12 men and 12 women; 6 of each sex were aged <40 y and 6 of each sex were aged 40 y). All subjects received 2 isoenergetic study diets assigned by using a randomized, balanced crossover design. One diet provided 17% of energy as fructose. The other diet was sweetened with glucose and was nearly devoid of fructose. Each diet was fed for 6 wk. Both diets were composed of common foods and contained nearly identical amounts of carbohydrate, protein, fat, fiber, cholesterol, and saturated, monounsaturated, and polyunsaturated fatty acids. All meals were prepared in the metabolic kitchen of the General Clinical Research Center.

Results: The responses to the study diets differed by sex. In men, the fructose diet produced significantly higher fasting, postprandial, and daylong plasma triacylglycerol concentrations than did the glucose diet. The daylong plasma triacylglycerol concentration after 6 wk of the fructose diet was 32% greater in men than the corresponding concentration during the glucose diet (P < 0.001). The fructose diet had no significant effect on fasting or postprandial plasma triacylglycerol concentrations in women. The fructose diet also had no persistent effect on fasting plasma cholesterol, HDL cholesterol, or LDL cholesterol in either men or women.

Conclusions: Dietary fructose was associated with increased fasting and postprandial plasma triacylglycerol concentrations in men. Diets high in added fructose may be undesirable, particularly for men. Glucose may be a suitable replacement sugar.

Key Words: Dietary fructose • dietary glucose • healthy adults • plasma lipids • plasma glucose • serum insulin

American Journal of Clinical Nutrition, Vol. 72, No. 5, 1128-1134, November 2000 © 2000 American Society for Clinical Nutrition

Source: http://www.ajcn.org/cgi/content/abstract/72/5/1128