It’s almost shocking how much of our food contains added sugar. Of course, there are apparent sources like candy and soda, but they also hide in seemingly innocuous places—salad dressings, granola bars, yogurt, and more. Regardless of how we consume it, all that added sugar can seriously affect skin health.

Added sugar fuels inflammation, which in turn accelerates signs of aging and aggravates conditions like acne, rosacea, eczema, and psoriasis. This is due to a biological process called glycation, where excess sugar binds to proteins like collagen and elastin, weakening the skin’s structure and contributing to fine lines, sagging, and dullness. On top of that, sugar spikes insulin levels, triggering a cascade of inflammatory responses that intensify breakouts and flare-ups.

Does that mean you must swear off sugar to maintain a youthful complexion? Not necessarily.

Like all things dietary, the key is understanding how added sugars impact your skin differently than the natural sugars found in whole foods and making small, sustainable changes supporting long-term skin health.

The Science Behind How Sugar Affects Your Skin

When sugar enters your bloodstream, it creates a chain reaction in your skin due to two primary biological processes: glycation and insulin-driven inflammation.

Glycation: The Collagen Killer

Collagen and elastin form the support matrix that keeps your skin youthful, but when excess sugar circulates through your bloodstream, glycation causes the sugar molecules to bind to the proteins. Upon binding, harmful molecules called advanced glycation end-products (AGEs) form.

To understand the effect of AGEs on your skin proteins, imagine them as a fresh rubber band that you leave exposed to the elements. Eventually, it becomes dry and fragile, unable to maintain its shape. The same thing happens to the collagen in your skin when your body produces AGEs. Over time, that loss of elasticity and shape causes the structure of your skin matrix to start breaking down, causing the common signs of aging like wrinkles and sagging.

AGEs also cause oxidative stress, so damaged cells can’t repair themselves as efficiently as they once could.

The Insulin-Inflammation Connection

Insulin is a hormone your body produces to help regulate blood sugar levels. Eating something with a high glycemic index, like candy, soda, and refined carbohydrates, causes a spike in your blood sugar, which then prompts an insulin release to bring it back down. While the occasional blood sugar spike is normal, excessive insulin production triggers pro-inflammatory cytokines. These molecules are part of the immune system and are used to fight infections by increasing redness, heat, swelling, and irritation at the site of an injury.

Excess cytokine activity for those with inflammatory skin conditions keeps the skin in a state of chronic inflammation, making flare-ups more frequent and intense.

  • Rosacea: Frequent blood sugar spikes make capillaries more prone to dilation, resulting in persistent flushing that lingers long after a trigger is removed.
  • Eczema: Further weakening of the skin barrier, making it more vulnerable to moisture loss and external allergens.
  • Psoriasis: Accelerates skin cell overproduction, leading to worsening plaques.

Sugar-Induced Acne

You’ve likely heard the rumor that chocolate causes acne, and while the chocolate itself isn’t the culprit, there is some truth to the idea that sugary food can worsen breakouts.

In addition to inflammatory reactions that make blemishes more painful and slower to heal, insulin also stimulates androgen hormones—primarily testosterone— which increase sebaceous gland activity and create the ideal conditions for clogged pores and bacterial overgrowth.

Higher insulin levels are also tied to suppressing sex hormone-binding globulin (SHBG), a protein that keeps androgen hormones in check. The less SHBG, the more oil production, particularly in areas prone to hormonal breakouts, like the jawline and chin.

4 Practical Solutions to Limiting the Effects of Glycation

Cutting out sugar entirely isn’t realistic or necessary. Instead, your goal should be minimizing added sugar’s inflammatory effects with a balanced diet.

1. Prioritize Low-Glycemic Foods

Not all sugars affect your skin the same way. Low-glycemic foods—such as whole grains, legumes, nuts, and fiber-rich vegetables—cause slower, more gradual rises in blood sugar, reducing insulin spikes and inflammatory responses. Swapping refined carbs for complex carbohydrates can help stabilize blood sugar and prevent excessive oil production and skin stress.

2. Make Smart Sugar Swaps

Stary by replacing high-glycemic, refined sugars with alternatives that are less likely to cause dramatic blood sugar spikes. These options might include:

  • Dark chocolate (70%+ cocoa) instead of milk chocolate for a lower-sugar treat with antioxidants.
  • Cinnamon enhances sweetness without added sugar, and studies suggest it may help improve insulin sensitivity.
  • Instead of fruit juice, try snacking on berries, which contain natural sugars, antioxidants, and fiber, the last of which slows down how quickly your body absorbs sugar.  

3. Balance Sugar Intake with Skin-Supporting Nutrients

Even if you indulge in sweets occasionally, pairing sugar with skin-friendly nutrients can help minimize its impact.

  • Antioxidants in citrus fruits and leafy greens to fight oxidative stress and glycation damage.
  • Omega-3 fatty acids for skin barrier support.
  • Collagen-boosting foods, including bone broth and eggs, for skin matrix support.

4. Stay Hydrated

Adding dehydration on top of glycation only worsens the effects. Stay on top of your water intake to flush out excess sugar while supporting your skin barrier health. Incorporate  a moisturizer formulated to combat A.G.E.’s and reverse it’s effects. MEG 21 Face Treatment and MEG 21 Advanced Formula formulated with Supplamine®, which has been clinically proven to reduce fine lines and wrinkles while it counteracts glycation, inflammation, and oxidative stress and boosts collagen production to improve skin’s firmness, elasticity and hydration. SkinCeuticals A.G.E. Interrupter Advanced is formulated with 18% concentrated ProxylaneTM, 4.25% wild fruit flavonoids and 0.1% glycyrrhetinic acid, this breakthrough anti-wrinkle face cream is clinically proven to visibly smooth fine lines and five types of wrinkles impacted by glycation and collagen decline.

Smart Sugar Choices for Improved Skin Health

You don’t have to cut sugars completely out of your diet in order to reduce glycation’s effect on inflammatory conditions. Instead, make sustainable changes and work with your dermatologist to develop a long-term management plan.

At Advanced Dermatology & Cosmetic Institute, Dr. Elizabeth Briden specializes in helping patients reduce flare-ups in patients with inflammatory skin conditions, combining her expertise with in-office treatments and clinically-tested, pharmaceutical-grade skincare products. So, if you’re struggling with stubborn redness, chronic breakouts, or any other unusual inflammation, schedule a consultation and regain control over your complexion.