Some of the worst things to do after a meal disguise themselves as relaxation. A hot
shower can stall digestion, while a cup of strong tea can neutralize up to 70 percent of a
meal's iron value.

Following a large meal, the human body enters a parasympathetic "rest and digest"
state, dedicating blood flow and energy to the gastrointestinal tract. Disrupting this
delicate physiological process can lead to discomfort and impaired nutrient absorption.

Lying flat immediately

The stomach is a muscular sac filled with highly corrosive hydrochloric acid. A muscular
ring called the lower esophageal sphincter acts as a valve to keep this acid contained....

Full story:
https://www.quora.com/What-are-the-worst-things-to-do-after-eating

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