Beyond its use in producing yogurt, butter, cream, condensed and sweetened milk, and milk powder, it is also used in making sweets, chocolate, ice cream, baked goods, white sauces, luxury soaps, plastics, dyes, buttons, hairpins, and eyeglass frames. It is even used to improve soil for certain plants and in the production of nutritional and dietary supplements. Milk is also considered one of the most important sources of calcium, which is essential for bone development and the prevention of osteoporosis, particularly among children, athletes, and older adults.
However, milk consumption varies considerably from one country to another. People in Northern Europe consume hundreds of liters of milk annually, compared to significantly lower consumption levels in East Asia. This difference can be attributed to the following factors:
1. Lactose intolerance - Billions of people worldwide have difficulty digesting lactose, the natural sugar found in milk. Humans are born with the enzyme lactase, which breaks down lactose and allows infants to digest milk. However, lactase production generally declines after weaning. Over generations, genetic mutations developed in certain populations, particularly in Northern Europe and some pastoral communities in North Africa and the Middle East, allowing the body to continue producing lactase throughout adulthood. This adaptation is known as lactase persistence. However, a large proportion of East Asian populations experience lactose intolerance because their bodies typically produce less lactase after weaning.
2. Cultural and dietary traditions - Milk and dairy products have become an integral part of traditional diets in Northern Europe and other regions. In East Asia, however, soy milk and other plant-based beverages have historically served as popular alternatives.
3. Climate and agricultural conditions - Dairy farming requires green pastures and a relatively cool climate, conditions that are not readily available in many Asian regions. This is particularly true of societies that traditionally focused on raising camels and sheep rather than cattle.
4. Economic and industrial factors - Milk is highly perishable, and its fresh consumption requires reliable refrigeration, processing facilities, and efficient transportation networks. These systems may be limited in some countries, particularly those with fewer economic resources.
Humans began consuming milk relatively late in their history, initially facing challenges digesting it. At the time, animals that could provide a regular supply of milk had not yet been domesticated. When and why did this change? Although the exact time and place where humans first began drinking cow’s milk remain unknown, several historical milestones provide important clues. Around 12,000 years ago, people living in the mountainous regions surrounding present-day Turkiye began transitioning from hunting and gathering to agricultural societies.
This transformation required the domestication of animals, beginning with sheep and goats. Researchers believe that adults began consuming fresh milk thousands of years ago. Genetic mutations associated with lactase persistence emerged in certain populations around 8,000 years ago, allowing adults to continue digesting lactose. These mutations likely developed in communities that had already incorporated fresh milk into their diets.
The genetic adaptations spread more rapidly in Northern Europe, where shorter growing seasons made milk a valuable and reliable source of calories, protein, and hydration. Cows, in particular, produced larger quantities of milk than other domesticated animals. In colder climates, milk also remained fresh and drinkable for longer periods. Populations that consumed large quantities of milk were often taller and heavier. Those who could digest lactose also had a survival advantage, particularly during periods of famine.
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