well the ideal thing would be to not eat but i know that's difficult. however, there is always going to be a function or occasion where you think "i'll just eat that one day" and you do yourself more harm than good.
if you have to eat, go for fish/chicken with veg and no carbs if possible. however, if you could stand just having a shake and maybe moving your food on to your partner's plate, it's always an option. you could say you've had food poisoning and can't eat - no-one ever questions you as they don't want to know the gory details!! you can't drink on LT as it's dangerous to do so in ketosis.
God i sound like an old woman - but i think that's the advice that most of us would give - easier to stay on LT and glow inwardly with the satisfaction of a) losing weight and b) knowing you won't be hungover the next day ha ha