Eat fruit and take cold showers. The last time this was posted, someone said cold showers were the secret to looking young forever. I can't find much convincing official research (just blogs) to support that cold showers are beneficial to skincare, but I've been taking them nonetheless, and honestly, my pores have looked better :)
There very likely is zero correlation. But potentially, people who take cold showers represent a biased subset of the population, which is statistically more inclined to look young. This applies to pretty much EVERYTHING that is not done via high quality double-blind studies published in reputable, peer-reviewed journals. Point being: Repeating single actions of successful people statistically does not make you succe…
As an example, there was a study that eating a handful of almonds every day is correlated with a bunch of positive health outcomes. Then a follow-up paper determined that this is simply because nuts are a relatively expensive snack, so they're eaten regularly mostly by wealthier people. It's well established that being poor is bad for your health, and conversely being rich tends to allow healthy lifestyles in general.
The kind of people that take cold showers are the "health-nut" types that prioritise healthy living over comfort. They're a rare, self-selecting subset of the general population.
It's extremely difficult to do good science based on statistics of self-selecting groups, or groups highly correlated with wealth.