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You lose a pair of glasses. You start off by saying:

• "My glasses could be anywhere." = I don't know where my glasses are. They could be here, there, up, down. In that room, or in another room. I don't know. The glasses are in one of those many different places.

after a few minutes of searching you might say:

• "I've looked everywhere for my glasses." = I've looked here, there, up, down, in one room, in another but with no luck. Conclusion: I still don't have my glasses.

• "I know my glasses must be somewhere" = They are not here, there, up, nor down, in one room or in another. But they can't have disappeared. I had those glasses just a minute ago. Where are they?

I ask my wife where my glasses are. She always knows where things are.

• "Do you know where my glasses are? I can't find them anywhere." = I've looked everywhere but I didn't find them in any of the places I looked.

My wife replies patiently

• "Yes I do, as a matter of fact, they're on your head."

The term health food is a compound noun and refers to foodstuffs such as muesli, etc. Usually, but not necessarily, you will go to a health food shop to buy such items. There is no guarantee (in the UK) that health food is especially good for you, and some health foods, such as muesli bars, may be frowned upon by dietary experts.

Healthy is simply an adjective, so healthy food is food that is generally acknowledged to be good for you, such as fresh fruit and vegetables. The opposite, of course, is junk food.

Cambridge Dictionary: Health food

Collins Dictionary: Health food shop

Healthline: 10 Processed Foods to Avoid