sandra hassink.director of the aap institute for healthy childhood weight and former president of the american academy of pediatrics. dr. hassink, welcome and thank you for joining us. i just want to set out with a definition here for folks at home. when we talk about obesity we're , not talking about weight or size. for children in particular, it's measured as a percentile within their age and sex and a child with a bmi in that 95th percentile or higher is considered obese. do i have that correct? dr. hassink: yes. bmi greater than 95th percentile is a screening test for obesity. i think it's important to point out at this point that it's a screening test, and when you have a bmi that triggers fther evaluation of the child. amna: let's talk about the guidelines. give me a broad overview, why are the new guidelines necessary now? dr. hassink: we are at a point in time where we have a lot of new and encouraging evidence that intense health and behavioral lifestyle treatment is effective, it works. we