10 Fascinating Facts About Chocolate to Celebrate International Chocolate Day

International Chocolate Day, celebrated today, offers a perfect moment to explore the rich history and science behind chocolate, the world's favorite treat. Originating with the Mayans and Aztecs, cocoa beans were once so valuable they served as currency, with 100 beans able to buy a slave and everyday goods priced in just a few beans. The original chocolate drink, called "xocoatl," was a bitter, spicy beverage flavored with chili peppers and corn, far from the sweet hot chocolate known today.

Scientifically, white chocolate is not considered true chocolate as it lacks cocoa solids, containing only cocoa butter mixed with sugar and milk. Chocolate uniquely melts just below human body temperature (34°C to 36°C), explaining its smooth texture on the tongue. Neurological studies show that the scent of chocolate increases alpha brain waves, which are linked to relaxation and stress reduction.

The solid chocolate bar is a relatively recent invention, first produced in 1847 by the British company J.S. Fry & Sons. It took nearly 30 more years for Swiss chocolatier Daniel Peter and Henri Nestlé to create milk chocolate by adding condensed milk. Since the 1960s, chocolate has been a staple in astronauts' diets, valued not only for nutrition but also for boosting morale during space missions.

The cocoa tree is delicate, growing only within 20 degrees north or south of the equator in humid, rainy climates. It takes a full year of harvest from one tree to produce just half a kilogram of chocolate. Dark chocolate with 70% or more cocoa solids is rich in antioxidants called flavonoids, which can improve blood flow, lower blood pressure, and support heart health. A British study also found that melting chocolate in the mouth can increase heart rate and brain activity, sometimes more intensely than kissing.