if sugar is important for human body then how diabetes (high and low) is so dangerous disease for humans?

Question

if sugar is important for human body then how diabetes (high and low) is so dangerous disease for humans?

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Answer 1

Back in the hunter/gatherer times, sugary foods (fruit) were seasonal treats to provide quick energy. What we have now is processed food artificially packed with sugar, which is addictive, to encourage us to buy more processed food.

Diabetes is a failure of the pancreas to provide the insulin needed to convert sugar in the bloodstream into energy loaded into cells where it can be used. Sugar molecules are crystals with sharp edges. When there is too much of it coursing around in the blood, it literally damages cells it runs into, causing all kinds of secondary health problems.