Last August, Dr. Delos M. Cosgrove, a cardiac surgeon and chief executive of the prestigious Cleveland Clinic, told a columnist for The New York Times that if he could get away with
it legally, he would refuse to hire anyone who is obese. He probably could
get away with it, actually, because no federal legislation protects the
civil rights of fat workers, and only one state, Michigan, bans
discrimination on the basis of weight.

Dr. Cosgrove may be unusually blunt, but he is far from alone. Public attitudes about fat have never been more judgmental; stigmatizing fat
people has become not just acceptable but, in some circles, de rigueur.
I’ve sat in meetings with colleagues who wouldn’t dream of disparaging
anyone’s color, sex, economic status or general attractiveness, yet
feel free to comment witheringly on a person’s weight.

Over the last few years, fat people have become scapegoats for all manner of cultural ills. “There’s an atmosphere now where it’s O.K. to
blame everything on weight,” said Dr. Linda Bacon, a nutrition
researcher and the author of “Health at Every Size: The Surprising
Truth About Your Weight” (Benbella, 2008). “If we’re worried about climate change,
someone comes out with an article about how heavier people weigh more,
so they require more fuel, and they blame the climate change crisis on
fatter people. We have this strong belief system that it’s their fault,
that it’s all about gluttony or lack of exercise.”

It’s no secret that being fat is rarely good for your career. Heather Brown (no relation) has experienced this firsthand. A few years ago,
she applied for a grant-writing job with a small nonprofit in the
Boston area. After a successful phone interview, she was invited to the
office.

“As soon as I shook the interviewer’s hand, I knew she would not hire me,” Ms. Brown said. “She gave me a look of utter disdain, and made a
big deal about whether we should take the stairs or ride the elevator
to the room where we were going to talk. During the actual interview,
she would not even look at me and kept looking to the side.” Ms. Brown,
36, who now works as an assistant dean at a college near Chicago, said
she never even got a “No thank you” letter after the interview.

That story is all too familiar to people like Bill Fabrey, an advocate who in 1969 founded the National Association to Advance Fat Acceptance. The organization’s archives, he says, are full of stories from people
who say they lost jobs or promotions because of their weight, or were
not hired in the first place.

Some of the most blatant fat discrimination comes from medical professionals. Rebecca Puhl, a clinical psychologist and director of
research at the Rudd Center for Food Policy and Obesity at Yale, has been studying the stigma of obesity for more than a decade. More than half of the 620 primary care doctors questioned for one study
described obese patients as “awkward, unattractive, ugly, and unlikely
to comply with treatment.” (This last is significant, because doctors
who think patients won’t follow their instructions treat and prescribe
for them differently.)

Dr. Puhl said she was especially disturbed at how openly the doctors expressed their biases. “If I was trying to study gender or racial
bias, I couldn’t use the assessment tools I’m using, because people
wouldn’t be truthful,” she said. “They’d want to be more politically
correct.”

Despite the abundance of research showing that most people are unable to make significant long-term changes in their weight, it’s clear that
doctors tend to view obesity as a matter of personal responsibility.
Perhaps they see shame and stigma as a health care strategy.

If so, is it working? Not very well. Many fat people sidestep such judgments by simply avoiding doctor visits, whether for routine
checkups, preventive screenings or urgent health problems.

Indeed, Dr. Peter A. Muennig, an assistant professor of health policy at Columbia, says stigma can do more than keep fat people from the
doctor: it can actually make them sick. “Stigma and prejudice are
intensely stressful,” he explained. “Stress puts the body on full
alert, which gets the blood pressure up, the sugar up, everything you need to fight or flee the predator.”

Over time, such chronic stress can lead to high blood pressure, diabetes and other medical ills, many of them (surprise!) associated with
obesity. In studies, Dr. Muennig has found that women who say they feel
they are too heavy suffer more mental and physical illness than women
who say they feel fine about their size — no matter what they weigh.

Even if doctors don’t directly express weight-based judgments, their biases can hurt patients. One recent study shows that the higher a patient’s body mass, the less respect doctors
express for that patient. And the less respect a doctor has for a
patient, says Dr. Mary Huizinga, the study’s lead author and an
assistant professor at Johns Hopkins School of Medicine, the less time
the doctor spends with the patient and the less information he or she
offers.

Fat stigma affects everyone’s health — fat, thin or in between. Last fall, Lincoln University in southern Pennsylvania announced that it
would weigh and measure all freshmen, and require those with a B.M.I.
over 30 to enroll in a special fitness class. Fat rights advocates
protested it as discrimination: If the fitness class was that important
to student health, shouldn’t everyone take it?

Lincoln’s administrators backpedaled after a storm of bad press. But the controversy underscores the fact that fat stigma isn’t about
improving people’s health, as doctors like Delos Cosgrove contend. If
it were, the conversation would be about health rather than numbers on
the scale and the B.M.I. chart.

Dr. Bacon tells the story of an overweight teenage girl whose high school was going through a “wellness campaign.” Hallways were plastered
with posters saying “Prevent teenage obesity.” After the posters went
up, the girl said, schoolmates began taunting her in the halls,
pointing at the obese girl on the posters and saying, “Look at the fat
chick.”

She said heavier students were now made to feel guilty about their lunch choices, but the thin ones could eat anything they wanted without
comment — even if it was exactly what the fat kids were eating.

“Stigmatization gives the thinner kids permission to think there’s something wrong with the larger kids,” Dr. Bacon, the nutrition
researcher, said. “And it doesn’t help them look at their own health
habits. There’s got to be a way to do this more respectfully and more
effectively.”

Harriet Brown teaches magazine journalism at the Newhouse School in Syracuse.