I think our parents' generation had a whole other set of problems to deal with.
There were children with rickets, children who smoked from the age of 8 or 9, children with no shoes or one shared coat, living ten in a bed and catching all kinds of diseases that hardly exist now.
Nowadays there is obesity and tooth decay - I was horrified by a program recently that showed hundreds of children having to have their milk teeth removed because of hidden sugars in products such as tins of beans.
The similarity is that both problems were caused by poverty - our parents and grandparents couldn't afford good food, and people now are being conned into buying the cheapest, almost toxic "food" by the big food companies. We really haven't come very far in the last 50 or 60 years.
More regulation of food companies by the government might help.