As a child I would eat porridge or cereal for breakfast, whatever was dished up at school dinner. A few sweets or a tomato after school, and dinner with a pudding at night. Glass of milk or warm drink before bed. Weekends would be the same only with a sandwich or a pie at lunchtime. There was no rationing on sugar, or salt. I did eat chocolate, but not much, and I did have full sugar fizzy drinks too, again, maybe one glass a day, the rest of the time I would have squash. I did eat chocolate, but not much.
I also went swimming 3 or 4 times a week and was out on my bike the moment I got home from school.
However we never went out for meals, and my mums portions were fairly small. There was also no snacking between meals.. ever. I also rarely eat fruit, as I just didnt like it, and still dont apart from an occasional taste, as I dont have a very sweet tooth.
I was average height and nowhere near as heavy as most of my friends. But I was also very healthy and rarely had so much as a cold.
I am now 42, still got all my own teeth despite all the sugar ;), perfect blood pressure, no cholesterol problems and apart from putting on weight (and losing it again thankfully) due to a sedentary lifestyle over the last few years I am doing ok.
I would say exercise is the biggest factor in most childrens health issues these days.. far too many hours are spent in front of the tv, or at the computer, and parents who are too nervous thanks to media hype to let their kids go far enough away playing out to get a decent amount of exercise. A bit of salt and sugar never killed the average person, but a lack of moving around regularly is not good at all.