They can increase a chance to become unhealthy, but it doesn’t make you automatically unhealthy as idiots tried to claim.
Even if an individual person is healthy under these circumstances, it’s still an unhealthy lifestyle and idolizing such a person also promotes this lifestyle, which will lead to other people becoming unhealthy due to the statistically proven correlation of this lifestyle and various diseases.
What exactly is “unhealthy lifestyle”? For an unfavourable variation/specimen it can simply be being born and living as even the mild environmental conditions will cause unsustainable damage. On the other hand, a strong specimen can withstand extreme environmental conditions without any long-term damage. As I said, statistics is completely useless here.