I was born at the start of the 60s. Unlike most people here it seems, we did eat a fair amount of sweet stuff - my mother had a really sweet tooth and baked a lot, and every evening meal had both main and pudding course.
She also cooked all our meals from scratch - I can remember my first meal out, for my 11th birthday, so clearly. I had fish and the waiter filleted it for me! Portions were smaller too - her dinner plates were about the size of our side plates - so I've recently started using them as dinner plates instead.
We didn't snack though apart from a Mars bar sometimes shared between 4 after dinner.
Fizzy drinks, a weekly treat at most, were always shared between my brother and me. I remember at university feeling finally free to have a whole can to myself - the amazing liberty!
Always walked to school, went for long walks with the dogs at the weekend.
I became overweight at 14, but luckily John Yudkin was in his prime and the wisdom was to cut out carbs still - the low fat thing had yet to happen. So I gave up my mother's cake after school and puds after dinner, lost weight and maintained it for a long time, until my hormones hit again in my late 40s.
One of the reasons I think a VLCD can be so useful if you have a fair bit of weight to lose is that it helps reset the snacking and the large portion size habits. If you can manage of 500 calories a day without being ridiculously hungry, then you know you don't need to fall face down in a metric tonne of lasagne every night.