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This Eighth-Grade Girl's Explanation Of Body Mass Index Is Going Viral

BMI says what?

An eighth-grade student's incredible response to "What is BMI?” is going viral.

Tessa Embry, of Indiana, responded to a health quiz query about BMI by explaining why she thinks Body Mass Index is an inaccurate measure of one’s health.

Here's how the CDC defines body mass index:

"BMI is a person's weight in kilograms divided by the square of height in meters. BMI does not measure body fat directly, but research has shown that BMI is moderately correlated with more direct measures of body fat."

BMI was first developed in 1850s by Lambert Adolphe Jacques Quetelet, but has since been criticized as an inaccurate and problematic gauge of health.

As NPR's Keith Devlin explains, "It makes no allowance for the relative proportions of bone, muscle and fat in the body. But bone is denser than muscle and twice as dense as fat, so a person with strong bones, good muscle tone and low fat will have a high BMI. Thus, athletes and fit, health-conscious movie stars who work out a lot tend to find themselves classified as overweight or even obese."

To answer her teacher's questions, Tessa first explained how outdated she thinks BMI is as a means of defining weight and obesity.

As Tessa explained to her teacher:

BMI is an outdated way of defining normal weight, under weight, over weight, and obesity by taking one person's height divided by their weight. One of the formula's obvious flaws, explains Alan Aragon, the Men's Health Weight Loss Coach and nutritionist in California, is that it has absolutely no way of discriminating fat and muscle. So, let's say there is a fairly athletic woman who maintains a decent diet, she's five feet, six inches, and she weighs 190 pounds, but 80% of her body is muscle. That doesn't matter when calculating BMI! This woman's BMI would be 30.7, and she would be labeled obese. Does that make sense to you? Because it sure doesn't make sense to me.

"[BMI] should not be used in a school setting where students are already self conscious and lacking confidence in their unique bodies,” she wrote.

Tessa then related her own struggles with weight and being a "bigger girl."

Despite being a great softball player, Tessa said she struggled with her body image.

At the beginning of the year, I started having very bad thoughts when my body was brought into a conversation. I would wear four bras to try and cover up my back fat, and I would try to wrap ace bandages around my stomach so I would look skinnier.

Tessa's mom Mindi also took her to her pediatrician, who assured her she was in fine health.

He did a couple tests and told me I was fine. He said though I'm a bit overweight, he's not going to worry about me based on how healthy I am. So this is where I don't calculate my BMI because my doctor, a man who went to college for eight years studying children's health, told me my height and weight are right on track. I am just beginning to love my body, like I should, and I'm not going to let some outdated calculator and a middle school gym teacher tell me I'm obese, because I'm not. My BMI is none of your concern because my body and BMI are perfect and beautiful just the way they are.

Mindi Embry said she's proud that her daughter stood up for herself.

"We encourage [our kids] to be the best people they can be," she told BuzzFeed. "We tell them to be proud of who they are. If they ever have insecurities about something they have no control over, we point out everything about them they should be embracing instead. We try to guide them toward their goals and help them make a game plan to reach them. They know they'll always have our full support."

Embry said she wants to discourage schools from teaching BMI, because kids are already so self-conscious about their bodies.

"These students already know where they fit in with everyone else," she told BuzzFeed. "They know what sizes the department stores keep downstairs and the ones they keep upstairs. This is like pouring salt in the wound. Especially for someone like my daughter who is bigger, but is strong, active, eats well, and has received a clean bill of health from her pediatrician."

She is hopeful that her daughter's test answers can inspire other teens. "I hope we can change one teenager's life through this awareness," she said.