Question

Why there is a sound stomach when my stomach is empty?

Answer 1

Explanation:

The physiological origin of this rumbling involves muscular activity in the stomach and small intestines. ... Though the rate and force of peristalsis typically increases in the presence of food, activity also increases after the stomach and small intestines have been empty for approximately two hours.

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Answer 2

Explanation:

Growling is more commonly associated with hunger because it is typically louder when the stomach and intestines are empty and so the organs' contents don't muffle the noise. ... The physiological origin of this rumbling involves muscular activity in the stomach and small intestines

When your stomach has been empty for two hours, it begins contracting to sweep remaining food into the intestines. This rumbling is called 'borborygmus'. Cells in the stomach and intestine produce ghrelin, a hormone that triggers feelings of hunger. Higher ghrelin levels are associated with obesity.