Actually, back in the 80's NASA funded actual work on this which showed a 25 sqm plot of potatoes could supply an astronaut's energy needs indefinitely. This was experimental work not modelling. Published in the American Journal of Potato Research Volume 64, Number 6, 311-320.
I can see why they might want a few other veggies though as you might get a bit bored just eating spuds, but they would only be for flavour.
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Spuds in space...
Actually, back in the 80's NASA funded actual work on this which showed a 25 sqm plot of potatoes could supply an astronaut's energy needs indefinitely. This was experimental work not modelling. Published in the American Journal of Potato Research Volume 64, Number 6, 311-320.
I can see why they might want a few other veggies though as you might get a bit bored just eating spuds, but they would only be for flavour.