I've been mostly eating potatoes in January. I've eaten other stuff as well and but probably 90% of calories have come from potatoes, early on it was entirely potatoes. I also took a multivitamin everyday. This seems to work fine, just microwave a potato for each meal. The potato is very satiating so there's no issue with over eating.

There's not much to clean up as it's just a potato, I have a plate in the microwave that I use to heat it then put it on a second plate to eat. I just eat it with my hands.

I've lost over 3kg (probably more like 6-7 I just didn't weigh my self before). I wasn't super fat or anything before hand. Perhaps it's too hard to get enough calories from only potatoes?

I haven't noticed any loss of muscle even though I've eaten almost no protein. It's made me very sceptical about nutrition as whole as I thought I would become sick or at least lose muscle mass (I was going to stop after a week if I lost muscle or became sick).

I will eat many more potatoes than I used to, even after January ends.