I was talking to DH about just this the other day.What we both remember is:
Apart from occasional fish and chips as a treat our grandparents only ate home-made from scratch meals or baking.
They ate smaller portions than we eat now. For example my gran served two smallish boiled half potatoes and 3 for men (😁). I would eat 3 or 4 smallish boiled potatoes and DH would easily eat 4 or 5.
There were no 'extras' so no snacks between those set times- no crisps for example or cheese and crackers, olives, dips and a beer/glass of wine watching tv.
They never had takeaways or bought ready meals.
They walked almost anywhere local eg within 3 -4 miles. Library, park, work, town, relatives or friends houses.
Our grandads had allotments.
We both recalled bags of boiled sweets but that was about it. Chocolate was an occasional treat.
There was just more moderation. My grandma's slices of cake were not generous at all. A biscuit would be a digestive or rich tea- nothing swathed in chocolate and just the one. Cheese was a small cut piece of cheddar or cheshire- no squishy moresome soft cheeses or tempting range of cheeses. I can demolish cheese. I think they were influenced by rationing. My gran never made anything with pasta or anything in a rich sauce. Sandwiches were simple affairs : a thin layer of cheese and sliced tomato, or ham and mustard. No mayo, not stuffed full of fillings, no large subway style buns, just two slices of bread. If she served crisps with sandwiches, it would be a normal sized bag split between 3 people, not a bag each.
I think we are much greedier now.