I am getting used to saying no to dessert. Often in the past I would order something, convincing myself I wouldn't eat it all...and then doing precisely that.
There are very few restaurants where a main course isn't enough to be comfortably full. There are even fewer where a starter AND a main course are not sufficient. By and large, the starters and main courses are better food options too.
So last night, in the very nice restaurant in my hotel, I ate starter (good choice), I ate main course (reasonably healthy, with added green leafy veg as a side), and I said no to bread, and I said no to dessert. It didn't even feel that difficult, unlike in the past.