Allostatic load refers to the cumulative wear and tear on the body due to chronic stress and the body's efforts to maintain homeostasis. This concept highlights how ongoing stress can lead to various health issues, as repeated activation of the body's stress response systems can result in long-term physiological changes. Understanding allostatic load helps to illustrate how social determinants of health, such as socioeconomic status and access to resources, can impact an individual's overall health and well-being.