Could you live eating nothing but peanuts for a really long period of time?

That sounds like a question a vegan would ask.

View attached image.

Not if you're allergic to nuts. You probably wouldn't live very long at all.

but why?

actually, the concept shown on the movie with the guy in mars is true.
you can survive for most of your life on Potatoes.

Yup. Radio static has informed me that you can live forever on peanuts. As long as you eat the shells because they contain the other stuff the nuts don't. So as a whole nut and shell make a complete food. 8]. However you will need water.