Is there a food that is cheap, delicious and healthy at the same time?

I have a theory that there is a impossible trinity (like in economics), where a food cannot be delicious, cheap and healthy at the same time. At maximum 2 of the 3 can be achieved.

Is there any food that breaks this theory?

Edit: I was thinking more about dishes (or something you put in your mouth) than the raw substances

Some popular suggestions include

  • fruits (in season) and vegetables
  • lentils, beans, rice
  • mushrooms
  • chicken
  • just eat in moderation

Edit 2: Thanks for the various answers. Now there are a lot of (mostly bean-based) recipes for everyone to try out!

Also someone made a community for cheap healthy food after seeing this topic!

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There are two perspectives on heathy/nutritious. If you're worried about overeating, calorie dense foods like Mac n cheese are bad, but if you're tight on money it's a cheap, calorie and nutrition dense food that can definitely be part of a healthy diet. I've had plenty of days eating Mac n cheese, frozen spinach and black beans for dinner. One batch feeds me 4 dinners and costs <$5