http://health.msn.com/weight-loss/articlepage.aspx?cp-documentid=100218381&
GT1=31036
"But I Don't Eat That Much!"
By Emily Yoffe from O, The Oprah Magazine
Oprah.com
There's your friend in the size 6 jeans who always seems to be attacking a
cookie-dough ice cream cone; there's the stick-figure colleague who lunches
on burritos the size of her head. And then there's you. Day after day, you
toss the bread from your turkey sandwich, nibble on a Baggie of carrots,
and refuse desserts—yet you can't get the scale to budge downward. How is
it that you're still heavy when you'd swear on a stack of pancakes, "But I
don't eat that much!" Of course, many will acknowledge there's no mystery
as to why they struggle with their weight: They eat more than they should.
But a persistent minority of people recount tales of heroic food
deprivation followed by a humiliating inability to lose a single pound.
What's going on with them? Here are three possible explanations.
Second-helping amnesia
Most people underestimate the amount they eat, studies show—and it's more
likely to be true the heavier a person is. "Scientists have searched for
people who eat very little yet weigh a lot," says James O. Hill, Ph.D.,
director of the Center for Human Nutrition at the University of Colorado
and cofounder of the National Weight Control Registry (NWCR), which tracks
people who have maintained a loss of at least 30 pounds for at least a
year. "What they have found instead are people who say they eat very little
but turn out to eat quite a bit when their food intake is monitored.
Rigorous studies show that it's impossible to be a really large person and
not eat that much."
Obesity researchers say this gap between perception and reality is not due
to conscious lying; these people truly believe they're living on very
little. For a study published 15 years ago in the New England Journal of
Medicine, Steven Heymsfield, M.D., and colleagues used a sophisticated
technique to monitor nine women and one man who weighed, on average, nearly
190 pounds, even though they insisted they ate only about 1,000 calories a
day. The results were startling, especially to the subjects. It turns out
they were actually consuming about 2,000 calories a day—twice what they'd
estimated. And though they guessed they were active enough to burn about
1,000 calories a day, the number was closer to 770.
Mary Schreiner, 61, a recently retired weight management counselor for the
University of Colorado's Health Sciences Center, understands how this could
happen. Barely more than 5 feet tall and 160 pounds as a young woman, she
tried counting calories and eliminating fattening foods, but the weight
just wouldn't come off. The problem, she realized later, was that "while
there were 75 calories in the cookie I wasn't having, I didn't know how
many calories there were in the orange juice I was guzzling." Many of her
clients were like her—drinking a lot of lattes, for example, because
"coffee has no calories, right?" But they never registered the fact that
each latte can have 200 calories. Or those who said that sure, they walked
10,000 steps a day but, when given pedometers, clocked in at only 1,500.
Another reason people may feel they're starving themselves, says Hill, has
to do with the metabolic drop caused by dieting: The lower your body
weight, the fewer calories you need to maintain that weight. (Exercise,
especially weight training, helps mitigate this unfair truth.) "Let's say
you weigh 250 pounds and eat 3,000 calories a day," explains Hill. "Then
you lose 50 pounds. To keep that off, you're going to have to eat only
2,300 calories a day—and it is very difficult to eat 700 fewer calories
than you're used to."
As for simply being born with a slow metabolism, that may be another common
misperception among the overweight. When Heymsfield carefully tested his
subjects—several of whom claimed to have this problem—all 10 had
metabolisms within the normal range. But instead of being relieved to
discover that there was nothing medically wrong with them—they just needed
to readjust their intake and output—"they were angry," recalls Heymsfield.
"They said, 'No, you can't be right.' Some said, 'My metabolism really is
slow; you just don't know how to find it.'"
Stealth spud syndrome
Heymsfield's subjects might be onto something, according to new research by
James A. Levine, M.D., a professor of medicine at the Mayo Clinic College
of Medicine in Rochester, Minnesota—but not in the sense that their bodies
don't burn food efficiently. Levine says some people have a biological
drive to beach themselves in a Barcalounger while others constantly flit
around like hummingbirds. He calls this nearly unconscious physical
activity NEAT, for "nonexercise activity thermogenesis." NEAT encompasses
everything from sitting up straight to tapping your foot to gesturing with
your hands when you talk. A hundred or so years ago, he says, people
typically burned 1,500 more calories a day than they do now. Even those who
would rather be relaxing, thank you, had to plow the fields or walk to town
or take the laundry to the creek and slap it on rocks. But in our age,
people born with the urge to sit find that the world is one big, comfy
couch—an inert way of life that, Levine believes, is enough to explain the
obesity epidemic.
For a study published two years ago in Science, Levine took 20
self-described couch potatoes—10 lean and 10 mildly obese—and dressed them
in high-tech underwear that recorded their bodily movements every half
second for 10 days. He discovered that his leaner spuds burned about 350
more calories a day through NEAT—or the equivalent of 33 pounds a year.
In an earlier NEAT study, Levine recruited 16 volunteers and for two months
had them eat 1,000 calories a day over what they needed to maintain their
weight. You would expect they'd all put on weight—1,000 extra calories a
day is a lot. But at the end of the study, the gain per individual ranged
from less than a pound to more than nine pounds. And all the variation,
says Levine, could be explained by the amount of NEAT.
The good news is that if you're not a natural-born fidgeter, you can
consciously work at overriding your biology. When Levine noticed his body
starting to thicken as he hit middle age, he put a treadmill in the living
room, and every night when he came home and watched "The Simpsons" (some
have their wine, others de-stress with Homer), he did it while walking. He
lost 15 pounds over a period of nine months without changing anything he
ate.
A weight vaccine?
It may sound far-fetched, but the theory that a virus can make you fat is
gaining credibility. In 1986 Nikhil Dhurandhar was treating obese patients
in Bombay, India, while working on a Ph.D. in biochemistry, when he had a
conversation with a fellow scientist about an avian virus that was killing
poultry. The scientist mentioned an odd effect the virus had on the
infected chickens: Their abdominal cavities were full of fat, and the dead
birds were far heavier than their healthy counterparts. "A sick chicken
should be a skinny chicken," Dhurandhar thought. He wondered what would
happen if he exposed normal chickens to the virus. Sure enough, the ones
that got infected developed significantly more body fat than the healthy
birds and, paradoxically, lower cholesterol and triglycerides.
The findings were so compelling that he decided to test his patients for
antibodies to the virus—and he discovered nearly 20 percent of them had
been infected. Not only that, these were among the heaviest people in his
practice, and they had lower cholesterol and triglycerides than most of his
other patients.
Today Dhurandhar is a scientist at the Pennington Biomedical Research
Center in Louisiana, studying a field he has named infectobesity. He and
others have found nine viruses that cause obesity in animals, four of which
also infect humans. He may have discovered part of the mechanism as well:
After animals are infected with one particular human virus, their pre-fat
cells mature and proliferate, increasing the number of fat cells in the
body.
Dhurandhar says we are a long way from being able to tell some overweight
people that their problem is a virus, or better yet, offering an obesity
vaccine. But he points out that there is exploding research in the area of
germs causing other chronic illnesses such as heart disease, autoimmune
diseases, even depression. And he cites the experience of the two
Australian researchers who suggested that a bacterium was responsible for
stomach ulcers and were scoffed at for years—until they won the Nobel Prize
for Medicine in 2005. Famously, one of those researchers swallowed a Petri
dish of the bacteria to prove his case. Is the slender Dhurandhar willing
to infect himself with one of his viruses to prove his thesis? He laughs
and says if he did it and gained weight, "people would just say I ate too
much."
Chicken viruses, NEAT factor—maybe these culprits explain why we're fat. Or
maybe we get too little sleep. Or have too much stress. Or modern indoor
temperature control protects us from the hot, sweaty, appetite-dulling days
and shivering cold that used to keep people trim. Every few months, there
seems to be a new theory. But whatever pans out among these ideas, science
knows right now what works to lose weight and keep it off: Move more and
eat less. That means making active choices whenever possible—getting up and
changing the TV channel, taking the stairs, and being more conscious when
it comes to diet (keep a food diary; look up calories at
nal.usda.gov/fnic/foodcomp/search, and check out nwcr.ws). As for those
people who holler that they eat like birds but complain they look like
butterballs, whatever the cause of this dilemma, if you're mindful about
what you put in your mouth, it feels as if you're eating a lot more.
FAQ
Search
Profile
Private Messages
Log in
