Google the rations for WW2 and the recommendations for a healthy diet. It will surprise you.
Beware poverty porn especially that indulged in by people who never experienced it or the rosy days of rationing. You know that fabulous rationing diet where everyone was so slim? You still had to pay for it. If you couldn't afford your two eggs a week or whatever, you didn't get them. There was no welfare state until 1948 so if you couldn't afford medical care, and most people couldn't, you either got better or died.
My own parents, who were born in 1918 and 1923 ate fairly nutritious food when they were growing up. Do you want to know how they did it? Neither of them had a back garden to grow lovely fruit and veg but they both had a yard in which they kept rabbits and chickens to kill for meat. And a duck that kicked up a racket whenever thieves came by. He ended up in the pot too.
The other key thing was that both of them came from families of just four children when other families had 10 or more. Both my maternal and paternal grandmothers died shortly after giving birth to my parents which combined with an extended family and both my grandfathers' willingness to work themselves into an early grave - neither of them reached 70 - meant my parents, who lived relatively nearby but didn't know each other when growing up, were considered to be quite posh.
Rationing ended officially in 1954 - nearly 70 years ago - but in reality ended before then. My mum, who died nine years ago aged 90, told me. But if she hadn't I'd still know all about it because people who never lived it keep banging on about it.
Yes, she and my dad who would be 104 now, did grow up in unheated houses and not have as many biscuits and fizzy drinks as children do now. There was a lot of built-in exercise like walking to physical jobs, if there were any and sometimes men could burn off calories by fighting in the queue for a day's pay.
I did not have central heating until I was 10 and do not blame my parents. Given their background they were careful with their money. But when they had it they spent it. They would never understand people competing to deny themselves in an attempt to feel superior.
I'm wearing a t-shirt and tracky bottoms with bare feet in an unheated house now. We have not turned the radiators on since a cold snap in January 2021. That's because we live mid-terrace and don't really feel the cold. But if we did we'd turn the radiators on because luckily we can afford it.
I can also afford to indulge in fantasies about my excellent diet and activity regime but I don't really because that would make me look ignorant.