I tend to work of a basis of 2-3 meals a day. Probably something in between.
A healthy meal being carbs, protein, fruit/ veg.
Not that I stick to that flawlessly or I wouldn't be chasing a surplus half-stone. 
But then again being 40+ with a surplus half-stone is a relatively healthy place to be. I just don't want it growing or to replace my clothes.
I grew up with a fairly standard 80s diet of toast/ cereal for breakfast, school lunch and hot dinner- could be home cooked, could be something like Fray Bentos pies with tinned spuds and tinned veg, or beans on toast. Snacking frowned upon.
There does seem to be a general lack of understanding about what bodies need for general good health (without going into the minefield of optimal diets for different niches). Then there's the orthorexic zealots which MN has in abundance!
I am interested in general good health and when new or conflicting information comes out, I try to have the perspective of thinking about the big picture of health and what seems to have worked or not. A lot of diet advice in recent decades doesn't seem to have helped public health in recent decades- low fat diet foods, introducing sweetners, snacking " to keep your metabolism high". I'd rather tweak the proportions of food on my plate and generally have decent habits.
I also don't do "bad food" and "good food". There's obviously more nutritious food I need more of, and less nutritious food that I need less food, but the food or me eating it has no moral value.
Anyway, back to school mode approaches 🎉
After a rather disrupted 3 weeks of holidays, socialising, events and not being home enough to buy loads of salad, the damage is... back to square 1.
But- that is no net gain since starting at the begining of June, and I only really had a month before injury issues got in the way and stalled progress. So that's not bad.
I just need to get back in mode next week when normality resumes.
I should have a decent run of routine through the autumn to make progress before the festive disruption.