Is it okay to make protocol changes as long as they don’t result in consuming more calories?

Is it okay to eat less than I planned to eat?
When I went to prepare my meal, I had less veggies in the fridge than I thought, so I ate less.

Is it okay to have an apple instead of the meal I planned to have?
On one occasion, I got called into a meeting and didn’t have time to prepare my lunch, so I grabbed an apple instead of having my meal