This article was featured in One Great Story, New York’s reading recommendation newsletter. Sign up here to get it nightly. Allison is an actress. When we meet up for coffee — she has an almond-milk cortado — in midtown, something’s different about her, but I’m not sure what. She looks like an Instagram version of herself but in real life. It turns out she’s down about ten pounds and happy about it. “Somebody once told me I had a size-zero personality, and they assumed that I was thinner than I was,” she tells me. “We don’t talk about it, but...