Why Does Banana and Sprite Make You Throw up? the Brutal Science Exposed
The primary culprit is an explosive release of carbon dioxide inside an environment that cannot vent it. Carbonated soda holds dissolved carbon dioxide under pressure. Once opened, that gas gradually escapes into the atmosphere. When poured over textured, porous surfaces, however, dissolved gas molecules rapidly aggregate into bubbles at microscopic points known as nucleation sites.
Chewed banana forms a dense, fibrous paste suspended in saliva, rich in pectin and amylose starches. When a liter of carbonated beverage floods over this semi-solid slurry, the fibrous pulp creates millions of instantaneous nucleation sites. Instead of degassing slowly, the soda releases its dissolved carbon dioxide in a matter of seconds. A similar physical mechanism powers the famous Diet Coke and Mentos geyser.
Inside an open bottle, that gas shoots freely into the air. Inside the human body, the gas becomes trapped inside a heavy, viscous foam. Banana pectin acts as an effective stabilizing emulsifier. Rather than forming clean gas bubbles that gather at the top of the stomach and escape through a normal burp, the expanding carbon dioxide whips the chewed banana into a thick, frothy mousse. The gastric pocket fills with dense lather that effectively seals off the upper digestive tract.
