You're right of course! I've even read that some weight conscious stars don't even look at the menu but simply ask for what they'd like! It's the whole dressing palaver that can cause issues - I ask for no dressing here on salad, easy... but there's a chain of restaurants (note Cheryl!) called "Hippo" who specialise in grilled steaks and meats, so excellent for us, but who PERSIST in putting butter on their green beans much as I request that they don't! grrr
But I've been to people's houses and nibbled on my left arm discreetly when dinner doesn't appear and it's 8pm! haaaa!