Specifically, University of California, Los Angeles (UCLA) psychologists report that girls who are told by a parent, sibling, friend, classmate, or teacher that they are too fat at age 10 are more likely to be obese at age 19.
The study looked at 1,213 African-American girls and 1,166 white girls living in Northern California, Cincinnati, and Washington, D.C., 58 percent of whom had been told they were too fat at age 10.
All the girls had their height and weight measured at the beginning of the study and again after nine years.
Overall, the girls labeled fat were 1.66 times more likely than the other girls to be obese at 19, the researchers found.
They also found that as the number of people who told a girl she was fat increased, so did the likelihood that she would be obese nine years later.
The findings are currently published online in the journal JAMA Pediatrics and will be found in hard copy in June.
“Simply being labeled as too fat has a measurable effect almost a decade later. We nearly fell off our chairs when we discovered this,” said A. Janet Tomiyama, Ph.D., the study’s senior author.
“Even after we statistically removed the effects of their actual weight, their income, their race, and when they reached puberty, the effect remained. “That means it’s not just that heavier girls are called too fat and are still heavy years later; being labeled as too fat is creating an additional likelihood of being obese.”
Co-author Jeffrey Hunger, a graduate student at University of California, Santa Barbara, said that simply being called fat may lead to behaviors that later result in obesity.
“Being labeled as too fat may lead people to worry about personally experiencing the stigma and discrimination faced by overweight individuals, and recent research suggests that experiencing or anticipating weight stigma increases stress and can lead to overeating,” he said.
In a separate study published last December, Tomiyama, and colleagues analyzed 21 long-term studies on weight loss and health and found no clear relationship between weight loss and health improvements related to hypertension, diabetes, cholesterol, and blood glucose.
“We found no connection whatsoever between the amount of weight loss — whether small or large — and any of these health outcomes,” said Tomiyama of the study, which appeared in the health section of the journal Social and Personality Psychology Compass.
“Everyone assumes that the more weight you lose, the healthier you are, but the lowest rates of mortality are actually in people who are overweight,” she said.
“At a body mass index of 30, which is labeled obese, there is no increased risk of mortality. This has now been shown over and over again. The highest rate of mortality is in the underweight people.”
The research findings also confirmed the results of a 2007 study in which Tomiyama and colleagues analyzed 31 long-term studies and found that people can initially lose five to 10 percent of their weight on any number of diets, but the majority regain all the weight, plus more.
Only a small minority, they discovered, sustain their weight loss.
“If dieting worked, it wouldn’t be a $60 billion industry,” said Tomiyama, who said trying to be thin is about as easy as trying to be taller.
“The genetic power over weight is about the same as the power of genes over your height,” she said. “People who say it’s your fault if you’re fat underappreciate the role of genes.”
Research has shown that twins separated at birth have very similar weights, regardless of the environment in which they grow up, Tomiyama noted.
She recommends focusing on eating healthier and fitness rather than obsessing about weight and strongly opposes stigmatizing people who are overweight.
“When people feel bad, they tend to eat more, not decide to diet or take a jog,” she said. “Making people feel bad about their weight could increase their levels of the hormone cortisol, which generally leads to weight gain.”