A study of people in the Journal of American Medical Association found the Zone diet helped people achieve modest weight loss after one year, comparable with those on the Atkins , Weight Watchers and Ornish diets, and improved cardiac risk factors. Just finished day 1 of the Turbo Takeoff… I was down 2 lbs this morning!!! Keep up the great work! Thanks for the excellent review and videos. Quadruple amputee beats the odds to walk down the aisle. The results are going to be different for everyone, but if you have 20, 30 lbs, or more to lose, then I would expect to be on the diet for at least two months.
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Studies that claim to have found weight loss were carried out on animals. Studies involving humans are for the most part badly designed. A few quality studies have been carried out over the years, starting in 1998 with a double-blind, placebo-controlled trial of 135 adults over 12 weeks published in The Journal of the American Medical Association.