Sugar Sag: Are You Accidentally Caramelising Your Skin?

We're all familiar with the usual suspects when it comes to skin ageing: sun exposure, smoking, stress. But what if one of the most significant — yet least-discussed — drivers of ageing is happening right on your dinner plate?

It's a process called glycation, and it's essentially caramelising your skin from the inside out.

As an aesthetic and longevity doctor with over two decades of clinical experience, I've seen firsthand how profoundly lifestyle impacts the way we age. And the science is unequivocal: what we eat has a direct and lasting effect on our skin's structure, function, and longevity.

What Is Glycation? The Science of 'Sugar Sag'

Glycation is a natural chemical reaction that occurs when excess sugar molecules in your bloodstream attach themselves to proteins or fats. This bonding process creates new, harmful molecules called Advanced Glycation End-products — or AGEs. The name is rather fitting.

Think about what happens when you toast a piece of bread or sear a steak. That beautiful golden-brown crust? That's the Maillard reaction — a form of glycation happening right before your eyes. While it makes food taste extraordinary, a similar process inside your body has far less desirable consequences.

When AGEs form internally, they transform your body's vital proteins into stiff, dysfunctional structures. It's like taking a new, springy rubber band and leaving it out in the sun until it becomes brittle and loses its snap.

How AGEs Damage Your Skin

Your skin owes its youthful structure to two critical proteins: collagen and elastin. Collagen provides firmness and strength; elastin provides flexibility and 'snap-back'. Both are prime targets for AGEs.

When glycation occurs, it cross-links these fibres, making them rigid and weak. This internal damage manifests externally as:

Effect	What You See
Stiff, brittle collagen	Increased wrinkles and fine lines
Damaged elastin fibres	Sagging and loss of firmness ('sugar sag')
Impaired antioxidant defence	Dull, lacklustre complexion
Chronic inflammatory response	Accelerated overall ageing (inflammageing)

Your body also recognises AGEs as foreign invaders, triggering a low-grade, chronic inflammatory response. This is what I call inflammageing — the intersection of chronic inflammation and accelerated biological ageing — and it is a central theme of my book, Busting the Code to Ageing: How to Win the Inflammation Game.

The Hidden Sources of AGEs in Your Diet

Here is where it gets interesting — and perhaps a little uncomfortable. It is not just sugary desserts that are the problem. AGEs are abundant in many common foods, particularly those cooked at high, dry temperatures.

As I discuss in Chapter 7 of my book, the biggest dietary culprits include:

•Crispy, browned, and charred foods: Crispy bacon, roast potatoes, the golden skin on a roast chicken, barbecued meats, and even your morning toast. That irresistible browning is glycation in action.

•Ultra-processed foods (UPFs): Manufactured using high heat and containing refined sugars, industrial seed oils, and additives, these products arrive pre-loaded with AGEs.

•Repeatedly heated oils: The oil in a chip shop fryer, used over and over at high temperatures, is a significant source of both AGEs and their equally damaging cousins, Advanced Lipoxidation End-products (ALEs).

The real danger comes from the 'double hit': you are ingesting AGEs directly from food while simultaneously spiking your blood sugar, which triggers your body to produce even more AGEs internally. It is, as I describe in the book, like pressing fast-forward on your body's ageing process.

How to Protect Your Skin from Glycation

The good news is that you do not need to resign yourself to a diet of bland, boiled food. It is about making smarter, more informed choices — consistently.

1. Eat the Rainbow

Fill your plate with colourful fruits and vegetables. These are packed with antioxidants that help your body neutralise the damaging effects of AGEs and free radicals. Berries, leafy greens, and citrus fruits are your skin's best allies.

2. Manage Your Blood Sugar

Swap refined carbohydrates (white bread, pastries, sugary drinks) for complex carbs such as quinoa, brown rice, and sweet potatoes. Stable blood sugar means fewer AGEs produced internally.

3. Change Your Cooking Methods

Opt for lower-temperature, moist-heat cooking — steaming, poaching, stewing — more often than grilling, roasting, or frying. You can still enjoy your food; just be mindful of how often you are charring and crisping.

4. Read Labels Like a Detective

If an ingredient list reads like a chemistry textbook, it is likely an ultra-processed product high in AGEs. Choose foods with ingredients you recognise — or better yet, foods that do not need an ingredient list at all.

5. Prioritise Lean Protein and Healthy Fats

These are the building blocks for healthy collagen. Wild-caught fish, chicken, legumes, avocados, and nuts all support skin structure without the AGE burden of processed alternatives.

The Dr Vix Takeaway

Glycation is a fundamental, yet underappreciated, driver of skin ageing. But it is not your destiny.

By understanding the process — by knowing why that crispy bacon is doing what it is doing — you can make conscious, informed choices that significantly reduce your AGE load, protect your collagen, and support your skin's long-term health.

Your body is running on ancient biological software in a modern nutritional world. The secret is not to fight it, but to work with it.

"Those deliciously crispy, browned foods are loaded with AGEs. When combined with high blood sugar, they create a perfect storm of ageing compounds in your body."

— Dr Vix Manning, Busting the Code to Ageing: How to Win the Inflammation Game

Ready to go deeper and win the inflammation game?

👉 Grab your copy of Busting the Code to Ageing here

Dr Vix Manning is an aesthetic and longevity doctor with a special interest in inflammageing. She is the author of Busting the Code to Ageing: How to Win the Inflammation Game (Rowanvale Books, 2025).