Mutton fell out of favor in most Western countries during the second half of the 20th century, and it never really came back. The reasons are a mix of flavor, economics, cultural shifts, and a self-reinforcing cycle where low demand led to low availability, which kept demand low. In countries like the US and UK, lamb now dominates the sheep meat market almost entirely, while mutton remains a staple in parts of the Middle East, South Asia, and New Zealand.
What Mutton Actually Is
The difference between lamb and mutton comes down to the animal’s age. Lamb comes from sheep under 12 months old, identified by the absence of permanent incisor teeth. Once a sheep develops permanent teeth that are “in wear,” touching the upper pad of the mouth, the animal is no longer classified as lamb. Mutton comes from mature sheep, typically over two years old. Some countries recognize a middle category called hogget, roughly 12 to 24 months, but in the US market this distinction barely exists.
That age difference changes everything about the meat: its fat content, its flavor intensity, and its texture.
The Flavor Problem
Mutton has a stronger, gamier taste than lamb, and for many Western palates that’s a dealbreaker. The flavor comes largely from fat. Mature sheep carry about 1.5 times more intramuscular fat than lambs, and that fat has a different chemical profile. As sheep age, they accumulate higher concentrations of branched-chain fatty acids, which produce the distinctive “sheepy” or “muttony” taste that divides opinion.
Lamb, by contrast, is mild enough to appeal to people who otherwise eat mostly chicken and beef. It fits neatly into the modern Western preference for lean, neutral-tasting protein. Mutton demands specific cooking techniques, longer braising times, and bold seasoning to work well. For a home cook unfamiliar with it, the learning curve is steep and the margin for error is wide. Undercook it and it’s tough. Cook it without enough spice or acid to balance the fat, and the flavor can be overwhelming.
World War II and the Cultural Turning Point
Mutton was common in American and British kitchens through the early 20th century. What changed was largely World War II. Military rations in both the US and UK included large quantities of low-quality mutton, often poorly prepared and served to soldiers who had no choice but to eat it. An entire generation came home associating mutton with bland, greasy, institutional food.
At the same time, postwar agriculture was shifting. The wool industry, which had been a primary reason for keeping sheep to maturity, declined as synthetic fabrics took over. Farmers had less incentive to maintain older flocks, so they began slaughtering animals younger. The lamb supply grew, mutton supply shrank, and consumer preferences followed. By the 1960s and 70s, mutton had largely disappeared from American grocery stores.
Supply and Availability
Today, finding mutton in the US is genuinely difficult. Most supermarkets don’t carry it at all. When it does appear, the price gap with lamb is surprisingly small. USDA retail data shows lamb stew meat advertised around $4.99 per pound and mutton stew meat at $4.49, only about 10% cheaper. That modest discount isn’t enough to motivate shoppers to seek out an unfamiliar product, especially one with a reputation for being tough and strongly flavored.
The economics work against mutton in another way too. Raising a sheep for two or more years costs significantly more in feed and labor than sending it to market at under a year. Farmers can turn over lamb much faster, making it more profitable per head even at similar retail prices. Without strong consumer demand pulling mutton through the supply chain, producers have little reason to change their approach.
Where Mutton Thrives
Mutton’s unpopularity is specifically a Western phenomenon. In India, Pakistan, Bangladesh, and much of the Middle East, “mutton” is often the default term for red meat, and dishes are built around its bold flavor. Slow-cooked curries, biryanis, and stews use spices, yogurt, and long cooking times to transform mutton’s intensity into something complex and deeply savory. These culinary traditions developed alongside the ingredient rather than in spite of it.
New Zealand stands out among Western nations for maintaining a much stronger preference for sheep meat, including mutton. The country’s massive sheep farming industry and relatively small population mean mutton remains accessible and culturally normal in a way it simply isn’t in the US or most of Europe. Parts of rural Britain, particularly in northern England and Scotland, also retain some tradition of mutton eating, though it’s niche.
Nutritional Differences Worth Noting
Ironically, mutton has some nutritional advantages over lamb. Research published in Archives Animal Breeding found that adult sheep meat has a more favorable ratio of omega-6 to omega-3 fatty acids compared to lamb. Mutton contains roughly 2.5 times more omega-3s than lamb (about 40 mg per 100 grams versus 15.5 mg). It also has higher levels of stearic acid, a saturated fat that research has linked to lower LDL cholesterol, the opposite of what most people assume about animal fat.
The higher overall fat content is real, but the fatty acid profile is more complex than “more fat equals less healthy.” None of this has been enough to drive a nutritional marketing push for mutton, partly because the volumes sold are too small for anyone to invest in that kind of campaign.
The Self-Reinforcing Cycle
Mutton’s unpopularity in Western markets is now largely self-sustaining. Shoppers don’t buy it because they don’t see it, don’t know how to cook it, and have no cultural memory of eating it well-prepared. Retailers don’t stock it because nobody asks for it. Farmers don’t raise sheep to maturity because there’s no market. Cookbooks and food media rarely feature it because the audience isn’t there.
Small revivals have popped up in recent years, driven by nose-to-tail eating movements and chefs interested in older, more flavorful cuts. A few specialty farms in the US and UK now market mutton directly to restaurants and through online retailers. But these remain tiny compared to the lamb market, and there’s no sign that mutton is on the verge of a mainstream comeback. The taste gap between what Western consumers expect from meat and what mutton delivers is simply too wide for most people to cross without a compelling reason to try.