LITTLE ROCK, Ark. \u2014 Sixth-grade boys were lining up to be measured in the Mann Arts and Science Magnet Middle School library. As they took off their shoes and emptied their pockets, they joked about being the tallest.<\/p>\n

\u201cIt\u2019s an advantage,\u201d said one. \u201cYou can play basketball,\u201d said another. \u201cA taller dude can get more girls!\u201d a third student offered.<\/p>\n

Everyone laughed. What they didn\u2019t joke about was their weight.<\/p>\n

Anndrea Veasley, the school\u2019s registered nurse, had them stand one by one. One boy, Christopher, slumped as she measured his height. \u201cChin up slightly,\u201d she said. Then Veasley asked him to stand backward on a scale so he didn\u2019t see the numbers. She silently noted his height as just shy of 4 feet, 7 inches, and his weight as 115.6 pounds.<\/p>\n

His parents later would be among thousands to receive a letter beginning, \u201cMany children in Arkansas have health problems caused by their weight.\u201d The letter includes each student\u2019s measurements as well as their calculated body mass index, an indicator of body fat. The BMI number categorizes each child as \u201cunderweight,\u201d \u201cnormal,\u201d \u201coverweight,\u201d or \u201cobese.\u201d Christopher\u2019s BMI of 25.1 put him in the range of obesity.<\/p>\n

In 2003, Arkansas became the first state to send home BMI reports about all students as part of a broader anti-obesity initiative. But in the 20 years since, the state\u2019s childhood obesity rates have risen to nearly 24% from 21%, reflecting a similar, albeit higher, trajectory than national rates. During the pandemic, the state obesity rate hit a high of more than 26%.<\/p>\n

Still, at least 23 states followed Arkansas\u2019 lead<\/a> and required height and weight assessments of students. Some have since scaled back their efforts after parents raised concerns.<\/p>\n

One school district in Wyoming used to include a child\u2019s BMI score in report cards<\/a>, a practice it has since stopped. Ohio allows districts to opt in, and last year just two of 611 school districts reported BMI information to the state. And Massachusetts stopped sending letters home<\/a>. Even Arkansas changed its rules to allow parents to opt out.<\/p>\n

Multiple studies have shown that these reports, or \u201cfat letters\u201d as they\u2019re sometimes mockingly called, have had no effect on weight loss. And some nutritionists, psychologists, and parents have criticized the letters, saying they can lead to weight stigma and eating disorders.<\/p>\n

BMI as a tool has come under scrutiny, too, because it does not consider differences across racial and ethnic groups, sex, gender, and age. In 2023, the American Medical Association called the BMI \u201cimperfect\u201d<\/a> and suggested it be used alongside other tools such as visceral fat measurements, body composition, and genetic factors.<\/p>\n

All that highlights a question: What purpose do BMI school measurements and letters serve? Nearly 20% of American children were classified as obese just before the pandemic \u2014 up from only 5%<\/a> some 50 years ago \u2014 and lockdowns made the problem worse. It\u2019s unclear what sorts of interventions might reverse the trend.<\/p>\n

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Joe Thompson, a pediatrician who helped create Arkansas\u2019 program and now leads the Arkansas Center for Health Improvement<\/a>, said BMI letters are meant to be a screening tool, not a diagnostic test, to make parents aware if their child is at risk of developing serious health issues, such as heart disease, diabetes, and respiratory problems.<\/p>\n
Sharing this information with them is critical, he said, given that many don\u2019t see it as a problem because obesity is so prevalent. Arkansas is also a rural state, so many families don\u2019t have easy access to pediatricians, he said.<\/p>\n
Thompson said he\u2019s heard from many parents who have acted on the letters. \u201cTo this day, they are still our strongest advocates,\u201d he said.<\/p>\n
The program also led to new efforts to reduce obesity. Some school districts in Arkansas have instituted \u201c movement breaks<\/a>,\u201d while others have added vegetable gardens<\/a>, cooking classes<\/a>, and walking trails<\/a>. One district sought funding for bicycles<\/a>. The state does not study whether these efforts are working.<\/p>\n
Researchers say the BMI data also serves an important purpose in illuminating population-level trends<\/a>, even if it isn\u2019t helpful to individuals.<\/p>\n
Parents are generally supportive of weighing children<\/a> in school, and the letters have helped increase their awareness of obesity, research shows. At the same time, few parents<\/a> followed up with a health care provider or made changes to their child\u2019s diet or physical activity after getting a BMI letter, several<\/a> other studies<\/a> have found.<\/p>\n
In what is considered the gold-standard study of BMI letters<\/a>, published in 2020, researchers in California found that the letters home had no effect on students\u2019 weight. Hannah Thompson<\/a>, a University of California-Berkeley assistant professor who co-authored the study, said most parents didn\u2019t even remember getting the letters. \u201cIt\u2019s such a tiny-touch behavioral intervention,\u201d she said.<\/p>\n
Arkansas now measures all public school students in even grades annually \u2014 except for 12th graders because by that stage, the pediatrician Joe Thompson said, the students are \u201cbeyond the opportunities for schools to have an impact.\u201d The change also came after many boys in one school wore leg weights under their jeans as a prank, he said.<\/p>\n
Kimberly Collins, 50, remembers being confused by the BMI letters sent to her from the Little Rock School District stating that all her children were considered overweight, and that one daughter was classified as obese.<\/p>\n
\u201cIt offended me as a mama,\u201d she said. \u201cIt made me feel like I wasn\u2019t doing my job.\u201d<\/p>\n
She didn\u2019t think her children looked overweight and the family pediatrician had never brought it up as a concern.<\/p>\n
Hannah Thompson, the researcher from California, said that\u2019s the biggest problem with BMI letters: Parents don\u2019t know what to do with the information. Without support to help change behavior, she said, the letters don\u2019t do much.<\/p>\n
\u201cYou find out your child is asthmatic, and you can get an inhaler, right?\u201d she said. \u201cYou find out that your child is overweight and where do you even go from there? What do you do?\u201d<\/p>\n
Kevin Gee<\/a>, a professor at the University of California-Davis, who has studied BMI letters<\/a>, said the mailings miss cultural nuances. In some communities, for example, people prefer their children to be heavier, associating it with comfort and happiness. Or some eat foods that they know aren\u2019t very nutritious but are an important way of expressing love and traditions.<\/p>\n
\u201cThere\u2019s a lot of rich contextual pieces that we know influences rates of obesity,\u201d Gee said. \u201cAnd so how do we balance that information?\u201d<\/p>\n
Collins\u2019 daughter, now 15, said that as she\u2019s grown older she increasingly feels uncomfortable about her weight. People stare at her and sometimes make comments. (Collins\u2019 mother asked that her daughter\u2019s name not be published because of her age and the sensitive nature of the subject.)<\/p>\n
\u201cOn my birthday, I went to get my allergy shots and one of the nurses told me, \u2018You are getting chubbier,\u2019\u201d she said. \u201cThat didn\u2019t make me feel the best.\u201d<\/p>\n
Collins said it pains her to see her soft-spoken daughter cover herself with her arms as if she\u2019s trying to hide. The teenager has also begun sneaking food and avoids the mirror by refusing to turn on the bathroom light, Collins said. The girl signed up for tennis but stopped after other children made fun of her, her mother said.<\/p>\n
Looking back, Collins said, while she wishes she had paid more attention to the BMI letters, she also would have liked practical suggestions on what to do. Collins said she had already been following the short list of recommended healthy practices, including feeding her children fruits and vegetables and limiting screen time. She isn\u2019t sure what else she could have done.<\/p>\n
Now everyone has an opinion on her daughter\u2019s weight, Collins said. One person told her to put a lock on the fridge. Another told her to buy vegan snacks. Her mother bought them a scale.<\/p>\n
\u201cIt\u2019s a total uphill climb,\u201d Collins said with a sigh.<\/p>\n
This article was produced as a part of a project for the <\/em>Spencer Education Journalism Fellowship<\/em><\/a>.<\/em><\/p>\n
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