What Sugar Really Does to Your Skin: The Glycation Connection

Sugar's effects on weight and energy get most of the attention, but there's a slower, quieter process happening underneath your skin every time blood sugar spikes: glycation.

What glycation actually is

When excess sugar circulates in your bloodstream, sugar molecules can bind to proteins — including the collagen and elastin fibres that keep skin firm and springy. This reaction forms compounds called advanced glycation end-products, or AGEs. Once collagen fibres are glycated, they become stiffer, less elastic, and more prone to breaking down, which is one of the biological mechanisms behind premature skin ageing.

Where the sugar is actually coming from

It's rarely the spoonful in your coffee. Added sugars hide in sauces, flavoured yoghurts, granola, and most packaged snacks — the EU recommends keeping free sugars under 10% of total daily energy intake, and ideally closer to 5%, which is a lower bar than most people realise until they start reading labels.

What actually helps

You can't fully undo glycation, but you can reduce new AGE formation by moderating added sugar intake, and support your skin's existing collagen network with vitamin C — which is required for your body to synthesise new, undamaged collagen — plus antioxidants that help limit the oxidative stress that accelerates AGE formation.

It's a good example of why nutrition and skin health aren't separate topics: what you eat shows up in your skin's structure, not just your energy levels.