Each situation is different, like EastCoast/Bedok vs Ikea, but still I can see some common features

Option: eat nothing, but it’s hard to enjoy the family outing. Tough choice.
Option: controlled indulgence, but the cCost is extremely dangerous
Option: just stay out of the scene. Perhaps leave early.

— tip: bring fruits + raw veg, esp. EastCoast
— tip: eat dessert only