The body challenge consists of a diet where the goal weight is to be as close to Cinderella's proportions as possible.
It also requires a bit of math: To calculate your Cinderella weight, you'd have to measure your height in meters, square it, then multiply it by 18.
So basically, a woman who's 5'4" would clock in at roughly 1.65 meters, which, when squared and multiplied, would have a Cinderella weight of roughly 49 kilograms, or about 108 pounds.
It's easy to see where this challenge can go wrong.
According to the BMI (Body Mass Index) — which is shitty at correlating health and weight, but still the most popular method used — the Cinderella weight is either fully underweight, or on the border.
For example, a 5'4" woman with a Cinderella weight of 108 pounds would have a BMI of 18, which is veering between underweight and "normal" weight.
Plus, health looks different on everyone. Saying that one weight is a "goal" weight is terrifying, incorrect, and beyond messed up.
Regardless, equating a weight to a Disney princess isn't cool.
Hard pass on this.