Garlic's bite is a chemical weapon that only fires when you crush it
An intact garlic clove barely smells. Break its cells by chopping or chewing and stored enzymes set off a chain of sulfur reactions, producing the heat and stink that probably evolved to deter birds, insects and worms. Garlic packs far more of these compounds than any onion, shallot or leek.
Garlic, Allium sativum, is a bulb-forming relative of onions, leeks and chives, native to Central Asia, northeastern Iran and the Himalayan foothills. Babylonians, Egyptians, Romans and Chinese all used it, and its English name comes from Old English words meaning spear and leek. It comes in two subspecies and hundreds of varieties. Hardneck types, grown in cooler places, give fewer, larger cloves; softneck types, grown nearer the equator, pack small cloves tightly. Central Asia, with at least 120 cultivars, remains the centre of garlic diversity. Its wild ancestor is still uncertain, because most cultivated garlic is sterile.
The raw burn comes mainly from allicin, which triggers the same heat-sensing receptors that make spicy food feel hot. Cooking destroys allicin, which is why roasted garlic tastes mellow. Sulfur chemistry also explains two oddities. Under heat or acid, a compound called alliin reacts with amino acids to form pyrrole rings; chains of two look red, three blue and four green, so pickled garlic sometimes turns blue or green, harmlessly. And garlic breath lingers because allyl methyl sulfide enters the blood, reaching the lungs and skin pores hours after a meal. Studies found sipping milk with garlic cuts the odour best, thanks to its blend of fat and water.
Growing garlic almost always means planting individual cloves rather than seeds. In cold regions they go in about six weeks before the ground freezes. Many varieties need a long chill, called vernalization, to split into multiple cloves; without it you get single-clove 'solo' garlic, a type that originated in Yunnan. Elephant garlic, despite its name, is actually a kind of leek. Growers snap off the curly flower stalks, called scapes, to push energy into the bulb, and the scapes themselves are edible.
World production hit 30 million tonnes in 2024, with China supplying 73 percent. For all its folk reputation, there is insufficient clinical evidence that eating garlic brings any health benefit.
Source: Garlic
