Volume II: Your Skin Reflects How You Live

Last month, I wrote about why I always begin a consultation by looking at a patient’s hands. The hands are generally unprimed. They can give me clues about hydration, environmental exposure, texture, and lifestyle before I ever begin examining the face.

But there is another part of that examination that is just as important: understanding how the patient lives.

What do they eat? Are they properly hydrated? How much do they sleep? Are they under stress? Do they exercise? Do they drink alcohol?

The complexion does not exist independently from the rest of the body. What happens internally can eventually become visible externally. I have believed this throughout my career, and I still see evidence of it in patients every day.

The Complexion Keeps a Record

People tend to think of skincare as something we apply from the outside. Of course, topical care matters enormously. But the skin is a living organ — and our largest one. Its appearance is influenced by hydration, nutrition, hormonal activity, inflammation, circulation, stress, and the structural tissues beneath it.

We are also learning more about how skin barrier function may relate to health beyond the complexion. Emerging research has linked poorer epidermal barrier function with higher levels of systemic inflammation and faster decline in certain measures of cognition. The science is still developing, but it reinforces the importance of maintaining healthy, well-supported skin. Sometimes I can tell almost immediately when a patient is not properly hydrated. The skin may appear drier or less resilient. Fatigue can become more apparent around the eyes. Puffiness can tell another story.

In my book Younger, I wrote that the quality of what we eat eventually shows up in the skin. I still believe the fundamental principle: the skin needs the right environment — and the right raw materials — to function at its best.

Two Things I Pay Attention to: Sugar and Protein

When I talk to patients about nutrition and skin, two things come up again and again: sugar and protein.

With sugar, the concern extends beyond insulin resistance. Excess circulating sugar can participate in a process called glycation, in which sugar molecules interact with proteins and lipids. In skin, that matters because collagen and other structural proteins help give the complexion its firmness, flexibility, and resilience.

Protein represents the other side of the equation. Skin, hair, nails, muscle, and other tissues depend on amino acids for normal maintenance and repair. Collagen itself is a protein. This does not mean avoiding every dessert or believing that one high-protein meal will suddenly create younger skin. Biology is not that simple.

What matters is the pattern: limiting repeated exposures that can compromise tissue quality while giving the body the raw materials it needs to maintain and repair itself.

Sometimes You See It the Next Morning

There are also choices whose effects can be much more immediate.
Alcohol can contribute to dehydration and flushing. A very salty meal can encourage fluid retention. Combine the two at dinner and the evidence may be waiting for you in the mirror the following morning.

I know this personally. In Younger, I wrote about indulging in a tostada at the airport before a flight. It was delicious.

The next morning, I woke up with puffy eyes and a bloated stomach. My body had given me very clear feedback. I am not suggesting that anyone should live without the occasional piece of birthday cake, pizza, or indulgent dinner. I certainly do not. The lesson is awareness. When you begin paying attention, you start recognizing the connection between what you did yesterday and what you see today.

Creating the Conditions for Regeneration

This idea is also central to what I call, Regenerative Skin Intelligence. Skin is responsive and adaptive, continually reacting to its environment — both outside the body and within it. Skincare can support that biology from the surface, while nutrition, hydration, movement, sleep, and other lifestyle choices influence the environment supporting it from within. The objective is not perfection. It is to create the conditions that allow skin to function, repair, and renew as effectively as possible. That is why my answer to a concern about a line, blemish, area of laxity, or change in texture may extend well beyond a product or procedure. I want to understand the person attached to the complexion.

Your Skin Always Shows Your Habits

People often want to know the one food they should eat, the one ingredient they should avoid, or the one supplement they should take. I am much more interested in what they do repeatedly. There is an old principle in medicine: the dose makes the poison. Even water can be harmful in excess. One dessert, one salty dinner, or one glass of wine is not what determines how your skin ages. The greater concern is repetition. I would much rather see someone make good choices 80 percent of the time and enjoy the other 20 percent than pursue an unrealistic idea of perfection.

Healthy skin is built through thousands of ordinary choices made over time — how you nourish yourself, how you hydrate, how you move, how you manage stress, and how consistently you care for your complexion.

Enjoy the indulgence. Then return to the habits that support you. The skin is paying attention to all of it. And eventually, it has a way of showing you. Your skin reflects how you live.

- Harold Lancer, MD