I think people had less money in the day, but seemed to have better quality products either because they had no access to crap or did not aspire to own it
You might want to ponder how and why the Co-op started, then. Part of it's raison d'être was to supply "wholesome and unadulterated produce" which many retailers of the day (1844) did not do.
Yes but I think that you'll find "wholesome and unadulterated produce" meant something different then. I read / heard somewhere that some unscrupulous traders at that time were doing stuff like putting sawdust (and worse) in bread and so on.
And bulking-out processed foods with salt, sugar, starch and flour (all of which started in the 1950s) isn't? The adulteration has changed over time, but it's still there. Another thing worth considering is that in the 50s and 60s there were some really nasty chemicals (over-)used in food production. The most obvious one was DDT and that has had long term genetic effects
The odd thing is that research has shown that the popluation of the UK was probably at it's healthiest in 1945 after 5 years of war and a near-starvation diet. Perverse, in a way