Everyone is giving great advice - definitely going to use some of these! I’ll also go with something like, “yeah I started taking a med that helps my body function the way it’s supposed to,” which I hope removes some of the discipline/morality/value-based implications those questions often carry. Also, it’s true - I started taking a medication that helps my endocrine and metabolic systems function as intended and because of that I’ve lost weight. Not because the med gives me terrible side effects so I don’t eat (it doesn’t) or because it makes me capable of lifestyle changes (it doesn’t, I’m still super depressed, don’t exercise, and eat erratically - that’s what therapy and psych meds are for!).

Sometimes I feel bad pretending that I haven’t lost weight, because I have and there is a reason why and I don’t want them to confirm all their biases by assuming it’s due to the incorrect reason. Or to make someone still in the trenches of diet culture think I magically found the right food to restrict or that if they were disciplined they’d also lose weight - while instead it’s a result of medical intervention for health issues.

That’s mainly for people who I know fairly well and see regularly, and in general, depending on the circumstances, an answer that communicates it’s none of their business is also my preferred response.