For one serving sure it is not trivial to eat that, but spread it over 3 meals and it is very OK My grandmother told me that during WWII in Belarus many people

For one serving sure it is not trivial to eat that, but spread it over 3 meals and it is very OK My grandmother told me that during WWII in Belarus many people in villages for 3 years eat pretty much only potatoes plus few berries/mushrooms and little fish. It was pointless to keep any animals as those would be taken either by Germans, local police folks or partisans. And all potatoes were grown with pure manual labor as the were no horses and petrol for any kind of machinery was simply not available. Despite such diet people were not malnourished or underweight and even sold potato to get money for other stuff.