Here's a dicey one:
We are on a low-carb diet. Last summer, we went to France. You cannot be on a low-carb diet.
So, I ate the croissants.
Well, to keep it "clean", this had effects. Sometimes ones that were ... necessary to deal with.
So, when going on a trip, think about your diet. Will it change? If you anticipate eating more carbs, perhaps starting a bit early might be a good plan. That way, your system can adjust.