By avoiding the catching of viruses and diseases that weaken immunity, taking antioxidants as suplement, and screening early and consistently.

Because it’s not easy to distinguish what exactly caused these abnormalities, we can’t place an individual in an isolated environment where we can exclude additional variables, for example, where one individual was exposed to polluted air and another wasn’t. Another point is that it is unethical to expose people to various pollutants to see the effects.