The central inquiry revolves around the biological appropriateness of consuming a mammalian secretion beyond infancy. Lactose, a sugar primarily found in this secretion, necessitates the enzyme lactase for proper digestion. The prevalence of lactase persistence, the continued production of this enzyme into adulthood, varies significantly across human populations, suggesting an evolutionary adaptation linked to dairying practices.
Throughout human history, access to this nutrient-rich fluid has offered sustenance, particularly in regions where agriculture was challenging or unreliable. Its consumption provides calcium, vitamin D, and protein, contributing to bone health and overall nutritional well-being. However, the ability to digest lactose is not universal, leading to digestive discomfort for many adults worldwide, highlighting a complex interplay between genetics, environment, and dietary habits.
