I'm not old enough to remember 70 years ago, but my diet has changed massively in my 50 odd years.
My Mam wasn't much of a cook. When I was a child, we ate a lot of meat and two veg. dinners. Or things like stew and tripe. When fast food hit the shops, Mam was more than happy to abandon trying to please five moaning kids and would serve up fish fingers or those Fray Bentos steak and kidney pies or Findus crispy pancakes etc. Usually served up with mashed potatoes and baked beans or tinned peas.
We always had a roast on Sundays, but I think that was mainly to keep my Dad happy (he ate his Monday - Friday dinners in the canteen at his workplace).
Portions were definitely smaller. A standard roast chicken would do eight of us for dinner and there would be leftovers for chicken sandwiches for tea. The Fray Bentos steak and kidney pie alluded to earlier would be cut into six or seven portions.
We had Weetabix for breakfast (our friends would have had Cornflakes or Rice Krispies), but money was tight and Mam reckoned Weetabix was better value. When I got to around 12 or so, I stopped eating Weetabix and switched to toast. On Sunday mornings we had a fry up - sausages, rashers, eggs etc.
I'm not sure if eggs were very expensive back then, or if Mam just had the impression that they were. But the way she went on about eggs, you'd think they were made of gold. Dad would get a boiled egg for his tea and we five kids would fight for who would get the top of the egg. We visited my great-aunt one day and she made us scrambled eggs on toast. I can't remember how many eggs she used, but Mam was shocked at the extravagance.
If we were hungry we were told, "There's plenty of bread in the press". We ate a lot of sandwiches - mostly cheese or jam. Sometimes we had tinned salmon sandwiches. We rarely had fruit. Occasionally apples or bananas.
Unlike a lot of kids here, we never had squash to drink. It was always tap water or milk. One of the reasons I loved Christmas so much was that Mam and Dad would buy bottles of Coke and Club Orange and 7Up for the Christmas. Such a treat.
We only had dessert on Sundays and it would be a home made apple tart or Victoria sponge cake (usually made by one of my older sisters).
We never had pasta based dishes like lasagne or spaghetti bolognese. The only rice dish I ever encountered was something called savoury rice which was served up at buffets at 21st birthday parties. It was yellow rice (cooked in turmeric, I presume) with tiny bits of peppers and peas and sultanas. I remember thinking it was quite tasty.
Take aways were very rare, due to the cost. If we did get a take away, it would be fish and chips.
It was only in the mid to late '80s that I encountered things like pizzas and pasta dishes. I thought they were divine. A friend's Mam was partial to a Chinese take away on a Saturday night, so I discovered Chinese food for the first time at their house. It would be another few years before I would encounter Indian food.
In lots of ways, my childhood diet was very unhealthy - lots of processed food, lots of bread, using lard for frying etc. We were a lot more active though. My parents never had a car, so we walked everywhere or took a bus (which entailed walking to the bus stop and walking from the bus stop to our final destination). We walked to and from school every day, in all weathers. We kids were out playing all day every day in the summer holidays. Most of our games involved exercise (skipping, chasing, playing tennis etc.). If we weren't playing games, we were cycling our bikes.