"Which Diet Works Best?"

That's a popular question around here. Rather than try to argue the merits of one diet over another, I'll point you to a study that appeared in a January 2005 issue of the Journal of the American Medical Association.

The researchers compared the effectiveness of 4 popular diets:

• Atkins (low carbohydrate)
  
• Ornish (low fat)
  
• Weight Watchers (calorie restriction)
  
• Zone (carb/protein/fat balance)

They randomly assigned 160 people to one of the diets above. After a year they assessed their findings.

They found all diets produced a modest weight loss, and all improved scores of cardiovascular health (the more weight the subject lost, the lower his cholesterol, C-reactive protein, and insulin levels) - as long as the participant stuck with the diet. The more extreme diets such as Atkins and Ornish had the greatest drop-out rates.

Maria Adams, author of the summary article I've linked below, included this comparison table:



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For a summary of the study:
Atkins, Ornish, Weight Watchers, and Zone Diets: A Comparison

For the study itself (abstract only, subscription required for full article):
Comparison of the Atkins, Ornish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Risk Reduction