Three habits that age your face

Most of what ages a face happens outside a clinic. It happens in the hours you are asleep, over the months you gain and lose weight, and across the accumulated minutes you spend outdoors without thinking about it.

Dr. Leem Soo Seong, a board-certified plastic surgeon and a co-director of BalanceLab, names three ordinary habits that make people look about five years older than they are. Two of them cost nothing to correct. The evidence behind them, it turns out, is not equally strong, and the differences are worth knowing before you decide what to change first.

Sleeping on one side

People do not distribute their sleeping positions evenly. Most settle on a side and stay there, night after night, for decades. Dr. Leem's observation is that the face pressed into the pillow ages faster, with the skin and the underlying fascial layer stretching on that side.

There is published work behind this. In 2016, Anson, Kane and Lambros described the mechanism in the Aesthetic Surgery Journal. Facial tissue under a sleeping head is subject to compression, tension and shear. The resulting creases are distinct from expression lines in how they form, where they sit, and which direction they run. The researchers called them sleep wrinkles.

Sleeping on your back avoids the compression entirely. Pillows designed to keep you there exist, and whether you can actually train yourself out of a lifelong position is a separate question the research does not answer. What the research establishes is the mechanism, not a trial showing that back sleepers end up with better faces.

Losing and gaining weight quickly

The reasoning here is structural. Gaining volume stretches the skin and the fascial layer beneath it. Losing that volume quickly removes what was filling the envelope, but the envelope does not spring back at the same rate. Repeat the cycle and the effect accumulates. Dr. Leem's position is that both directions are a problem, not just the losing.

This is the weakest-evidenced of the three, and it deserves to be labelled as such. It is mechanistic reasoning from clinical observation rather than a finding from a controlled trial. It is plausible, it is consistent with what surgeons see, and it has not been tested the way the other two have.

It is also increasingly relevant. Weight loss medication has made rapid, substantial loss available to far more people than a decade ago, and the facial consequences are now a routine consultation topic rather than an edge case.

Skipping sunscreen

This one has a randomized trial, which is rare for anything in cosmetic dermatology.

In 2013, Hughes and colleagues published results in the Annals of Internal Medicine from 903 adults in Nambour, Australia. Participants were assigned either to daily broad-spectrum sunscreen or to using it at their own discretion, and were followed for four and a half years.

Group	Skin aging over 4.5 years
Daily sunscreen	No detectable increase
Discretionary use	24% more aging than the daily group

That first row is the striking one. Over four and a half years, the daily group showed no measurable progression of photoaging at all. Not slower aging. None that the study could detect.

Dr. Leem's practical advice is to reapply three or four times across a day, which is more than most people manage. He says so about himself, on camera, apologising for putting it on once in the morning and then running out of time. The admission is more useful than the target. If a dermatologic surgeon who explains this for a living reapplies once, the realistic goal for everyone else is probably not four times. It is more than once.

Where to put your effort

If you only change one thing, change the sunscreen. It is the only item on this list with randomized evidence, the evidence measures skin aging directly rather than skin cancer, and the intervention costs less than a single clinic visit.

Sleep position comes second. The mechanism is documented and the fix is free, though it asks you to change something you do unconsciously for eight hours a night.

Weight cycling is third, not because it does not matter but because the evidence is thinner. If you are planning substantial weight loss, the relevant conversation is about the rate, and it belongs with the physician managing it.

None of this competes with what a clinic can do. It determines how much there is to correct when you get there.