Mom shares 'reverse' before-and-after photos that prove skinnier doesn't always equal happier.

Allison Kimmey, a body positivity activist, author, and speaker, is flipping the script on before and after photos. Kimmey went viral earlier this year when her daughter called her fat, which turned into a teachable moment about what "fat" is.

"No one IS fat. It's not something you can BE. But I do HAVE fat. We ALL have fat," she told her daughter.

Now Kimmey's latest viral series on Instagram is about prioritizing happiness over looks, viewing the "before and after" comparison shots not about celebrating thinness.