Skeptics Think Twice About Atkins Diet
New Studies in 2002 Left Us Asking If High-Fat Diet Is Safe After All
WebMD News Archive
Atkins Diet -- It's the Calories
Volumetrics author Barbara Rolls, PhD, who holds the
Guthrie Chair in Nutrition at Penn State University, offers a very simple
explanation as to why people lose weight doing Atkins: They're cutting
calories, even if they don't realize it. "No one has shown, in any studies,
that anything magical is going on with Atkins other than calorie restriction.
The diet is very prescriptive, very restrictive, and limits half of the foods
we normally eat," she says. "In the end it's not fat, it's not protein,
it's not carbs -- it's calories. You can lose weight on anything that helps you
to eat less, but that doesn't mean it's good for you."
To be fair, the Atkins diet has gotten a somewhat undeserved
reputation as an "all cheeseburgers, no vegetables" plan. Although the
early "induction" phase drastically reduces carbohydrate consumption,
requiring no fruits and only a very few leafy greens, that's only the first two
weeks. "Induction is very severe, but then you go up the carbohydrate
ladder. You may end up eating a fair amount of carbohydrates again six months
down the line, although the diet really advises you to avoid some things, like
white breads, white potatoes, and white rice, forever," says Foster.
"People will say that Atkins doesn't let you eat fruits and vegetables, and
that's inaccurate. He advises you to add fruits and vegetables and whole grains
early on in the process."
But the diet still isn't balanced, says the American Heart
Association, troubled by implications that it's changed its position on Atkins
since the November meeting. (It hasn't.) "A high intake of saturated fats
over time raises great concern about increased cardiovascular risk; the study
did not follow participants long enough to evaluate this," the AHA said in
So why did "bad cholesterol" levels go down for Atkins
dieters in the studies? "Any time people lose weight by any means,
cholesterol goes down," says Neal Barnard, MD, president of the Physicians
Committee for Responsible Medicine and a leading Atkins critic. "But the
idea that Atkins is a cholesterol-lowering diet -- the evidence on that is at
best very mixed."
Plus, slashing carbs and gulping fat may be dangerous to more
than just your heart health. Barnard points to research recently published in
the American Journal of Kidney Disease, based on studies of 10 healthy people
put on the Atkins diet. "Because their focus is kidney disease, they wanted
to look at calcium loss. It was awful: On the induction diet, calcium losses
were 65% above normal, and even on the more moderate maintenance diet, calcium
losses averaged 55% above normal," Barnard says. "Osteoporosis is a bad
enough problem as it is. If you do something that increases calcium losses,
you're just asking for hip fractures."