Library.

“Fruit remains in the human stomach for only about 15 minutes after being eaten.”

The 15-minute figure is not supported by clinical evidence. Whole fruit is a structured, fiber-containing food, not a clear liquid, and standard medical sources describe stomach emptying for solids in hours rather than minutes. Even unusually fast estimates for some fruits are generally above 15 minutes and do not justify a broad claim about all fruit.

“The human stomach can dissolve razor blades through its digestive acids.”

This claim is false as commonly understood. While stomach acid (pH ~1–2) is highly corrosive and can slowly corrode metal in laboratory settings — one study showed ~37% mass loss after 24 hours in simulated gastric juice — food and foreign objects typically remain in the stomach for only 30–120 minutes. Medical case reports consistently show ingested razor blades passing through or being surgically removed intact, not dissolved. The claim conflates a lab demonstration of slow corrosion with actual digestive capability.

“Swallowed chewing gum remains in the human stomach for seven years before being digested or expelled.”

This claim is a well-known myth. Multiple authoritative medical sources — including Mayo Clinic, Cleveland Clinic, Duke Health, and Britannica — explicitly state that swallowed gum does not remain in the stomach for seven years. While the gum base is indigestible, it passes through the digestive tract and is expelled in stool, typically within about 40 hours. "Indigestible" means it exits intact, not that it stays trapped. The seven-year figure has no scientific basis.