I'm old enough that my grandpa in 1930's was living not much different than a serf and was constantly malnourished, and it was in one of most fertile parts of Poland, country famous for its fertile fields (it's even in name, Poland means "Land of the fields/farmlands"). And that was 70 years after serfdom was abolished, because before that it was one huge horror story and literal slavery.

In short: peasants did not had it good.