Cracking the Fat Riddle

SHOULD YOU COUNT CALORIES OR CARBS? IS DIETARY FAT YOUR BIGGEST ENEMY? THE LATEST RESEARCH MAY SURPRISE YOU

If Kerry Sieger were a stone age hunter-gatherer instead of a 21st century molecular biologist, chances are she would have the taut, trim body of her dreams. In college, however, Sieger underwent such a dramatic weight gain that, ever since, she has been a size 6 butterfly struggling to emerge from a chrysalis of size 20 clothes. Over the years, she has tried a succession of diets--the Scarsdale diet, the Nutri/System diet, the Michael Thurmond 6-Week Body Makeover diet, even the cabbage-soup diet--but the pounds she has repeatedly lost have relentlessly crept back.

Now Sieger, 34, a research associate at a...

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