"The stigmatization directed at obese children by their peers, parents, educators and others is pervasive and often unrelenting," the researchers from Yale University and the University of Hawaii at Manoa write in the July issue of Psychological Bulletin. The paper is based on a review of all studies of youth weight bias over the last 40 years.
It comes amid a growing pandemic of child obesity. By 2010, almost 50 percent of children in North America and 38 percent in the European Union will be overweight, the researchers said.
While programs to prevent childhood obesity are increasing, more efforts are needed to protect overweight kids from abuse, said lead author Rebecca M. Puhl, a scientist at Yale's Rudd Center for Food Policy and Obesity here.
"The quality of life for kids who are obese is comparable to the quality of life of kids who have cancer," she said, citing one study. "These kids are facing stigma from everywhere they look in society."
Even with a growing percentage of overweight people, the stigma shows no signs of subsiding, she said, adding that television and other media reinforce the stereotypes.
"This is a form of bias that is very socially acceptable," Puhl said. "It is rarely challenged; it's often ignored."
The stigmatization of fat kids has been documented for decades. When children were asked to rank photos of children as friends in a 1961 study, the overweight youngster was ranked last.
Children as young as 3 are more likely to consider overweight peers to be mean, stupid, ugly and sloppy.
A growing body of research shows that parents and educators are also biased against heavy children. In a 1999 study of 115 middle and high school teachers, 20 percent said they believed obese people are untidy, less likely to succeed, and more emotional.
"Perhaps the most surprising source of weight stigma toward youths is parents," the report says.
Several studies showed that overweight girls got less college financial support from their parents than average weight girls. Other research showed teasing by parents was common.
"It is possible that parents may take out their frustration, anger and guilt on their overweight child by adopting stigmatizing attitudes and behavior, such as making critical and negative comments toward their child," the authors wrote, suggesting that further research was needed.
Lynn McAfee, 58, of Stowe, Pa., said that as an overweight child she faced troubles on all fronts.
"It was constantly impressed upon me that I wasn't going to get anywhere in the world if I was fat," McAfee said. "You hear it so often, it becomes the truth."
She said her mother, who also was overweight, offered to buy her a mink coat when she was 8 to try to get her to lose weight even though her family was poor.
"I felt I was letting everybody down," she said.
Other children would try to run her down on bikes to see whether she would bounce. She had a hard time getting on teams in the playground.
"Teachers did not stand up for me when I was teased," McAfee said.
A study in 2003 found that obese children had much lower quality-of-life scores on issues such as health, emotional and social well-being, and school functioning.
"An alarming finding of this research was that obese children had scores comparable with those of children with cancer," the researchers reported.
Sylvia Rimm, author of Rescuing the Emotional Lives of Overweight Children, said her surveys of more than 5,000 middle school children reached similar conclusions.
"The overweight children felt less intelligent," Rimm said. "They felt less popular. They struggled from early on. They feel they are a different species."
Parents should emphasize a child's strengths, she said, and teachers should pair up students for activities instead of letting them pick partners.
The new report recommends research on ways to reduce stigma and negative attitudes toward fat children.
"Weight-based discrimination," it concludes, "is as important a problem as racial discrimination or discrimination against children with physical disabilities."