Why We Love the Pain of Spicy Food - WSJ

Dec. 31, 2014 2:10 p.m. ET58 COMMENTSAs winter settles in and temperatures plunge, people turn to food and drink to provide a little warmth and comfort. In recent years, an unconventional type of warmth has elbowed its way onto more menus: the bite of chili peppers, whether from the red jalapeños of Sriracha sauce, dolloped on tacos or Vietnamese noodles, or from the dried ancho or cayenne peppers that give a bracing kick to Mayan hot chocolate.

But the chili sensation isn’t just warm: It hurts! It is a form of pain and irritation. There’s no obvious biological reason why humans should tolerate it, let alone seek it out and enjoy it. For centuries, humans have eagerly consumed capsaicin—the molecule that generates the heat sensation—even though nature seems to have created it to repel us.

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