system
Given the following post, respond as if you're commenting on Reddit:
human
What is the smallest farm that could entirely support a human being?
gpt
The calorie yield for potatoes -which will in most conditions have the highest- may reach about 15 million per acre per year.

Assuming a human needs 360*2000 = 720000 calories per year, then we need 0.048 acres = 194.249 m^2.

Of course, a human can not live on a diet of pure potatoes, but this calculation should give you the order of scale we are looking at.