You can pretty much survive on black beans and onions.
Iirc, beans have everything you need except for vitamin c, but I could be wrong about that.
You’re unlikely to be lacking most nutrients in a first world country, even eating tons of junk food.
That’s not me saying it’s okay to live on junk food, that’s me saying essential nutrients aren’t going to be your problem.
Edit:
I looked it up. You’ll be missing some components of a complete protein, so eat some grains too.
Agreed. As if every company just having a subreddit wasn’t bad enough.