Why am I and other people so tall if we eat poor nutrition?

I am 6 foot 3 and all my life I have never had good protein intake, always under ate, etc. Never drank milk, rarely anything. Why am I so tall then? I thought height was based upon genetics along with good nutrition? Not to mention I've seen some black people from some of the poorest slums in Africa and some... show more I am 6 foot 3 and all my life I have never had good protein intake, always under ate, etc.

Never drank milk, rarely anything.

Why am I so tall then? I thought height was based upon genetics along with good nutrition? Not to mention I've seen some black people from some of the poorest slums in Africa and some of them are extremely tall 6 foot 4-5 but are poorly malnourished.

Why is this?
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