What do you think of a diet consisting of ONLY the following 4 foods:
If someone ate these and only these foods, how do you think it would go? - in the short term? - in the long term?
would this be enough nutrients? would this be healthy?
You would not get enough variety of nutrients and vitamins. Eating a wide variety of fruits and vegetables is healthier. Add in some broccoli, kale, tomatoes and peppers and now we are talking about a diet.
Four very healthy foods. Add in a half-dozen more equally healthy ones and you'll be where you want to be. I may be wrong, and your four foods may be perfect, but eating a variety of healthy foods by definition gives you a larger range of nutrients while reducing the probability of overloading on any one.
If you're hypothyroid you won't want the spinach. If the BEEF category includes liver and kidney you won't need spinach. The liver will cover the iron, copper need and the kidneys will take care of selenium. Substitute some form of seafood for omega 3 and iodine instead of spinach.