Depends on the situation and the crowd. Family gathering, I tell them I’m fasting. Work, probably will tell them too. Clients I work with, I ate already and I’m on a strict meal plan.
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Planning lunches with clients and vendors ahead of time is where it gets sticky for me, I try to get out of it whenever possible. I also don’t fast a lot but do follow a pretty restrictive diet that isn’t really feasible at most restaurants.