The XXXL t-shirts apparently weren’t enough of a clue.

(Politico) — Michelle Obama on Wednesday weighed in on the one-year anniversary of the health care law her husband signed into law, arguing that the changes will help parents raise a generation of “happy and healthy kids.”

Sharing a “personal” story in an op-ed on Yahoo’s Shine website, Obama said that as a working mom in her pre-White House days, she had “the best intentions” to feed her daughters Malia and Sasha healthy food on a budget, but admitted that “sometimes pizza or the drive-thru were inevitable.”

The first lady, who launched a childhood obesity initiative, Let’s Move!, last year, said she was surprised when her pediatrician told her to pay more attention to the food she was feeding her daughters.

“They were active and growing, with a healthy sense of themselves, which Barack and I have always encouraged,” she writes. “But our doctor told me that their BMIs were creeping upwards. Now to be honest, I didn’t really know what BMI was. And I certainly didn’t know that even a small increase in BMI can have serious consequences for a child’s health.”

With the Affordable Care Act, she writes, “the information is not within reach for you and your family too — you just have to ask for it,” she writes, noting that the law requires insurance companies to cover preventative services like BMI screenings “without any kind of deductible, co-pay or co-insurance.”