That was most likely caused by the sudden population growth when Mao promoted large families but couldn't follow with agriculture and other food productions.
Population in China:
1949: ~500 million
1980: ~800 million
which represents an increase of 10 million people per year (on average).
but couldn't follow with agriculture and other food productions
It was worse than that. Not only could he not follow through, his collectivisation policies actually made farmers less efficient than they had been when left to their own devices. And he was busily exporting rice to east germany in exchange for high tech manufactured goods. That's right, middle of a famine he caused and he has the balls to increase exports.
Stop using facts, yo!
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