There is, especially related to Covid: metabolic health (see https://www.unc.edu/posts/2018/11/28/only-12-percent-of-american-adults-are-metabolically-healthy-c

There is, especially related to Covid: metabolic health (see https://www.unc.edu/posts/2018/11/28/only-12-percent-of-american-adults-are-metabolically-healthy-carolina-study-finds/ https://www.unc.edu/posts/2018/11/28/only-12-percent-of-amer...), which of course correlates to immune system health. There is only one definition of physical health, and that is the proper functioning of one's bodily processes, with the functioning of the immune system as the centerpiece.