5 Skin Habits From a Mayo Clinic Dermatologist

A camera flashes. A machine built to look like a tanning bed scans every angle of a face, and seconds later a report card appears: spots, wrinkles, pore size, UV damage, brown spots, redness, and finally a single number, a calculated skin age. Mel Robbins, 57, watches hers come back as 61 (20:38). The moment is a little deflating and, as it turns out, exactly the point. The report is not a verdict. It is information, a readout of decades of sun, sleep, and stress that the skin has been quietly logging.

That is the argument Dr. Saranya Wyles has built a career on. She is a dermatologist and physician-scientist at the Mayo Clinic, where she runs the Regenerative Dermatology and Skin Aging Laboratory and also directs the Center for Aesthetic Medicine and Surgery (03:32). Her opening claim reframes the entire conversation around skin care.

"Your skin is more than a beauty scorecard. It is actually information. It's a two-way conduit between the outside world and the internal systemic health." — Saranya Wyles [05:18]

She calls it a check engine light. The "all of a sudden" brown spot or flush that seems to appear overnight has usually been brewing for months (06:11). And the stakes go beyond vanity: patients with moderate to severe psoriasis, an inflammatory skin condition, carry a sixfold higher 10-year risk of heart failure, heart attacks, and stroke (08:06). Skin, in other words, is not separate from the rest of the body. It is the organ most exposed to the outside world, and it reports back.

The Circadian Life of a Face

One of the more useful ideas in the conversation is that skin runs on a clock, with two distinct modes. During the day it plays defense, managing oil, water, and barrier function against sun, pollution, and daily wear. At night it switches to something closer to offense, meaning active repair and regeneration.

"At daytime, it goes into defense mode... at nighttime, it switches into offense, more like a repair regeneration." — Saranya Wyles [28:03]

The data behind this is concrete. People who sleep well show 30 percent better recovery of the epidermal barrier, the skin's outer protective layer, compared with poor sleepers (28:48). The reverse also holds: just two consecutive nights of three to four hours of sleep measurably disrupts the skin's barrier and hydration in middle-aged women (29:32). Skin does not need chronic sleep deprivation to suffer. Two bad nights are enough to show up on a tape-strip test.

Wyles's one concrete lever here is magnesium threonate, taken one to two hours before bed. She says it helps the nervous system wind down and, at the level of skin cells, supports genes that produce more hyaluronic acid and the matrix proteins that keep skin plump (33:02).

Diet works on skin through a related mechanism: sugar. Wyles describes a process called glycation, where sugar molecules bond permanently to collagen and elastin, the proteins that give skin its structure, stiffening and breaking them down over time.

"Glycation is how sugars stick together, so it's sticky sugars that happen in your skin... and the sugar sticks to something called collagen and elastin." — Saranya Wyles [36:46]

In a 12-week randomized trial, acne patients who switched to a low glycemic index diet, meaning lower in sugar and refined carbohydrates, saw a 23 percent improvement in flares (35:33). A separate 2025 analysis of the UK Biobank, a large biomedical database drawing on over 200,000 people, found that higher fiber intake tracked with fewer psoriasis flares, likely because fiber blunts the blood sugar spikes that drive glycation (39:48). Wyles's own habit, inherited from her grandmother in Chennai, is a slow-cooked blend of apples (skin on, for the flavonoid quercetin), beets, and carrots, with chia and flax seed for fiber and calcium, turmeric for its anti-inflammatory effect, and coconut water for electrolytes (41:20).

Movement matters too, through a mechanism most people have never heard of: exosomes, tiny signaling particles cells release into the bloodstream. In a small randomized study of older adults, the group that exercised healed wounds an average of 10 days faster than the group that did not, something Wyles attributes to beneficial exosomes triggered by movement (50:59). A separate 16-week study of 56 middle-aged women found that resistance training, more than cardio alone, improved skin elasticity and strengthened the dermis, the structural middle layer of skin that holds collagen and elastin (52:43).

What Weight Loss Takes Away

Stress leaves its own trail. Skin carries real cortisol receptors, part of what Wyles calls a localized fight-or-flight system, and chronic stress measurably slows barrier recovery, as shown in a study of women going through divorce (59:40). Hair follows a similar, slower script: a major stressful event, a death, surgery, or job loss, typically shows up as noticeable shedding three to four months later (60:27). For hair thinning tied to male pattern baldness, Wyles points to a study in which 400 milligrams of daily pumpkin seed oil over 24 weeks shifted the androgens, hormones linked to hair loss, enough to support healthier follicles (62:17).

The episode's most vivid segment is a live test. Wyles applies five products, mineral sunscreen, chemical sunscreen, tinted sunscreen, coconut oil, and beef tallow, to Mel's forearm and scans each under a UV camera. The three sunscreens show a dark line indicating blocked UV light. The coconut oil and beef tallow show nothing (73:43). Her broader point: a tinted sunscreen's iron oxides also block visible light, which matters for melasma-prone skin, and sunscreen belongs in the car, since a New England Journal of Medicine photograph of a truck driver shows one side of his face aged by decades from decades of unprotected window exposure (74:26).

To explain sagging and jowls, Wyles reaches for cake. Skin has three layers (an outer epidermis, a structural dermis, and a fatty hypodermis) sitting on muscle, which sits on bone, like layers of cake on a platter. With age, the platter itself, the bone, shrinks, and the whole structure settles lower on the face (78:04). GLP-1 medications complicate this further. For every 20 pounds lost on a GLP-1 drug, patients lose roughly 10 percent of facial volume, because the fat layer that normally cushions the face thins out quickly, unlike the slow stretch of pregnancy weight gain (83:40). Wyles calls the resulting look, loose skin from rapid fat loss, Ozempic face, and her practical fix is the same lever as before: strength training, since muscle and skin are chemically linked through exercise-induced exosomes, and building muscle mass can help counter the sag.

What ties all five pillars together, sleep, diet, movement, stress, and topicals, is the same idea Wyles opened with: skin is not decoration. It is a reporting organ, and it is also a lever.

"The face gets the marketing budget, but the whole organ deserves the care, and that is healthcare." — Saranya Wyles [88:11]

The industry built around skin sells creams and serums as if the face were the whole story. Wyles's research says otherwise: the signals that actually change a face start somewhere less glamorous, in a decent night's sleep, a lower sugar plate, a set of dumbbells, and a tube of sunscreen kept in the glove compartment.