Sometimes I tell people that I am recovering from a stomach bug and I’m eating very lightly. No one wants to talk about diarrhea, but most people want to judge fasting. If they ask if I need anything I’ll say I have medication but a glass of warm water would be lovely. Makes the host feel like they have fed me.
I will also just say “I’ve eaten. Thanks.” and change the topic. If you are positive and upbeat most people will accept it and move on.
I’ve wondered if having a “healthshake” in an opaque cup would be good… really just ice water or tea but can belivably tell people that you’re doing a shake for lunch for your diet. Anyone tried this?