Okay kiddo, today we are going to talk about a lady named Katherine Flegal. She is a scientist who studies how much people weigh and what that means for their health. You know how we always talk about how it's important to eat fruits and vegetables and exercise so we can be healthy? That's what Katherine Flegal studies.
She did some research to figure out how many adults in the United States are overweight or obese. Overweight means you weigh more than what's healthy for your height and age. Obese means you're even more overweight and it can be dangerous for your health.
Some people didn't believe what Katherine Flegal found. They said she made a mistake or that her research wasn't trustworthy. But other scientists checked her work and they said it was correct. They even did their own research and found similar results.
So, Katherine Flegal's work helped us learn more about how many people in the United States are overweight or obese. It's an important problem to try and fix because being overweight or obese can cause health problems like diabetes and heart disease.
Does that make sense, kiddo?