Earlier quoted context omitted.
Can somebody explain the "won't eat vegetables" thing? The only place I've heard about this being in issue is in America.
Sugar/bread is easier. We solve this by having a tiered eating system that starts with some salad or veggies, if they don’t eat, they clearly aren’t deathly hungry; dessert is available at the end of the meal if they finish. Note this may require a family eating culture that includes salad et al. With every dinner, which is not the norm in America.
The danger with this pattern is that it encourages overeating - stuff in the vegies so you get dessert as well, and wind up eating way more food than you need.