What are the fundamentals of a healthy diet ?

I need to write an article on healthy eating for english.
Thank-you .

The fundamentals are to eat things that are as close to their natural state as possible… So instead of eating canned veggies, eat frozen and instead of frozen eat fresh… Prepare meals from scratch instead of relying on frozen and/or processed meals as they are full of preservatives and sugars. If you need a chemistry degree to figure out what’s in it don’t eat it. So if it didn’t have a mother or came from the ground don’t put it in your mouth.

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