If you are lucky enough to be fit and healthy, it may be that you have been eating which fruit, widely used in an expression about deterring the medical profession?

An apple

Explanation:

"An apple a day keeps the doctor away" is a popular English expression of long tradition. More than being a literal norm, it intends to promote healthy eating as a preventive mechanism to avoid disease.

An apple is a fresh fruit that provides the human body potassium, dietary fiber, vitamin A, vitamin C, sugar, protein, calcium and iron. These nutrients translate into health benefits and contribute to maintaining a health.

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