Umami, the fifth basic taste, was pinned down in 1908 from a bowl of kelp broth

For centuries the West counted four basic tastes: sweet, sour, salty and bitter. A fifth — umami, a deep savory “deliciousness” — was identified in 1908 by Japanese chemist Kikunae Ikeda of Tokyo Imperial University. Working from kilograms of dried kombu kelp, he isolated the compound behind his dashi broth’s richness: glutamate, the salt of glutamic acid. He named the sensation umami and patented a way to make monosodium glutamate (MSG) that same year.

The West stayed skeptical, and then turned hostile. In 1968 a letter to a medical journal coined “Chinese Restaurant Syndrome,” blaming MSG for headaches and palpitations after a meal. The phrase stuck, fueling decades of panic and “No MSG” signs — even though controlled, double-blind studies repeatedly failed to reproduce the symptoms in any reliable way.

The seasoning was vilified for a generation before the chemistry was ever pinned down.

Vindication came from molecular biology. Around 2000, researchers identified a dedicated receptor for glutamate on the tongue — the T1R1/T1R3 heteromer, a pair of G-protein-coupled proteins that respond to the very molecule Ikeda had isolated. With a physical receptor in hand, umami could no longer be dismissed as imagination.

Umami also breaks the rules of arithmetic: it’s synergistic. Pair glutamate with nucleotides like inosinate — abundant in bonito flakes and dashi — or guanylate from dried shiitake, and the savory hit doesn’t just add up, it multiplies many times over. That trick is why cooks across cultures instinctively combine kelp with fish, or tomatoes with parmesan: the savory backbone of soy sauce, cured ham and ripe tomato, amplified.