In Reuters Health yesterday was the following headline:
"Revenge of the high-carb diet-ha! it works to!"
It discussed a study appearing in the Archives of Internal Medicine showing that a high-carb diet resulted in more weight and fat loss than a lower carb diet. No doubt the U.S.D.A. and others will cite this study often.
However, when pulling the abstract, this is what they were comparing:
45% C 14% P 41% F
63% C 19% P 18% F
If you look closely, you will see that both dietary protocols contain a protein-carb ratio of 30-31%, so the insulin response based on the protein-carb ratio has changed little. The higher carb diet also contained an average of 26g of fiber per 1000kcal vs. 7g , which also gives the high-carb diet the appearance of being more effective since fiber slows the insulin response. It would be interesting to see that same high-carb diet put up against a Zone p/c ratio of over 50%, coupled with at least 25g fiber that one likely achieves from eat mostly fruits and vegetables. Considering that the above participants were still consuming an average of 2500 calories/day, I don't think it would be close.
Pariticipants on the higher-carb diet lost an average of 0.6 pounds/wk over 12 weeks (7lbs). This increased to 1.0lb/wk with 4/wk 45 min aerobic exercise. Its pretty evident that none of the three groups were controlling insulin very well.
Nicholas P. Hays [i:3c60b42102]"Effects of an ad libitum low-fat, high-carbohydrate diet on body weight, body composition, and fat distribution in older men and women."[/i:3c60b42102]Archives of Internal Medicine, Vol. 164, No.2, Jan 26, 2004