Which factor may NOT influence drug metabolism?

Drug metabolism is a complex process influenced by a variety of factors. Among these, genetic variability plays a significant role, as genetic differences among individuals can affect the expression and activity of enzymes responsible for drug metabolism. Environmental exposure, such as exposure to certain chemicals or substances, can also modify metabolic pathways through enzyme induction or inhibition. Furthermore, physical activity may influence metabolic processes, as exercise can affect blood flow and enzyme activity.

In contrast, skin color itself does not inherently influence drug metabolism. While it is true that certain populations may have genetic traits linked to different metabolic rates, skin color does not directly serve as a determinant for metabolic processes. The variation in drug metabolism is more closely associated with genetic factors, environmental interactions, and individual lifestyle choices rather than an individual's skin color. Thus, skin color is less relevant when discussing the factors that specifically impact the metabolism of drugs.