What is the term for food or drink that provides essential nourishment for the body?

The term that describes food or drink providing essential nourishment for the body is "sustenance." This word emphasizes the role of food not just as a source of calories, but more importantly, as a fundamental requirement for maintaining health and supporting bodily functions. Sustenance includes the necessary nutrients, such as carbohydrates, proteins, fats, vitamins, and minerals, which the body needs to grow, repair tissues, and carry out vital processes.

While "nutrition" refers to the study of how food affects health and the overall process of taking in nutrients, it does not specifically define the food itself. "Diet" pertains to the kinds of food that a person typically consumes, which may or may not refer to nutritious options. "Meal" signifies a specific occasion for eating, encompassing various dishes but not necessarily highlighting the aspect of nourishment. Thus, "sustenance" is the most accurate term to denote food or drink that fulfills the essential nourishment needs of the body.