However, the one aspect that was definitely different in their time was much of their food was home made.
I agree. But I would add one more thing that was different. Fewer daily calories. During the 20s and 30s, people didn't have the money to buy so many snacks. Finding the cash money for a single candy bar was a challenge, for many children.
Additionally, their parents were not obese, for the most part. And their grandparents weren't, either.
My grandparents lived into the post-WWII era, and I knew three of them personally.
