"Oh, I am not having much for lunch because we are going out for supper".
"Oh, I won't have a snack here in Starbucks because I prefer what we have at home."
Of course, being deeply fallible, I often then forget to supervise that later on the calories are truly being made up. Having said that, I DO supervise the breakfast fish finger sandwich and bowl of cereal, the 2 glasses of milk in the afternoon and supper, including pudding. Hot chocolate is now off the menu, replaced by a glass of milk btw. I guess that's okay even though it is less calorific.