Why were people slimmer in the olden days?

As I understand it last century, everyone smoked 60 a day, never exercised, drank beer morning noon, and night, and deep-fried everything. Salad was for decoration, and every meal was followed by pudding and custard.

Yet in every old photo I've ever seen you hardly ever seen anyone fat or unhealthy. Why?
Why were people slimmer in the olden days?
Why were people slimmer in the olden days?
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