Sugar crash

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A sugar crash is a concept in American folk medicine and refers to a feeling of tiredness which can occur after eating a large quantity of sugary foods.

[edit] Mechanism usually proposed by those who use the term

When eating a lot of sugar, we induce the release of large quantities of insulin. This large insulin release causes the cells to take up large, unregulated quantities of sugar from the blood and actually leaves us with a low blood sugar level in the end. This gives us the tired feeling - loss of energy which is due to the "sugar crash" which comes after the very temporary "sugar high" that we get from eating the sugary foods.

See reactive hypoglycemia.