@SavingTheBestTillLast regarding what's changed in the last 50 years.
The most pertinent to me is that now our biological faults are diagnosed and treated.
My mum killed herself when she was 46 due to undiagnosed and untreated depression, possibly a symptom of her PCOS, depression is a known symptom.
Her mum dropped dead at 60 suddenly of a heart attack, she had had a number of strokes over her lifetime, the first being in her early 30s. Heart disease and circulation issues are also symptoms of PCOS, Diabetes and Insulin resistance.
Her mum died in her 50s, cause unknown.
All struggled with their weight from being teenagers.
My mum was very careful to cook healthy, from scratch meals and limit snacks, my dad and brothers were healthy weight, if not a bit on the skinny side all their lives but from age 10 when puberty began I was always struggling, I was in weight watchers by the time I was 11. It was only when I was trying to conceive that doctors finally agreed to run tests and they showed high testosterone, cysts on my ovaries, insulin resistance. Even once diagnosed they wouldn't actually treat, just told me to lose weight. Losing weight pre-WLI for me meant no carbs other than those in green veg, no fruit, no bread, no pasta, no root vegetables and restricting calories to under 1000 a day. Anything more and any carbs then I did not lose weight. I tried everything, it was miserable, I would be so hungry constantly and feel weak, my hair would fall out, but even increasing to 1200 calories a day resulted in a gain.
I did lose enough weight through that diet to get regular periods and conceive, was diagnosed with Gestational Diabetes and put on insulin and metformin, and ended up losing a couple of stone while pregnant, but as soon as DD was born the GP told me I no longer needed diabetes treatment as it was solved by birth of placenta and discharged me. Not one of the GPs I saw after that over the years would do anything other than tell me I was fat and suggest I eat less and move more.
Till last year when I diagnosed myself with Diabetes, got proof by buying myself a continuous Glucose Monitor and presented at A&E with glucose levels so high the app was pinging me with messages to seek immediate medical advice.
So i guess from my family history and anecdotal evidence, what's changed is that fat women with hormonal problems used to die younger and not clutter up the world with fat older women.