We have all heard the claim: “Sugar ages your skin.”
It sounds simple. Eat less sugar, and perhaps you'll have fewer wrinkles, better collagen and clearer skin.
But the science is considerably more interesting and more complicated.
There is a genuine biological connection between glucose metabolism and skin health. One of the most important mechanisms is glycation.
What is glycation?
Glycation: When Sugar Changes the Structure of Skin
To understand how sugar may influence skin aging, we need to look beyond the sugar sitting on your plate and into what happens to glucose inside the body.
One of the key processes is called glycation.
Glycation is a chemical reaction in which sugars such as glucose and fructose attach themselves to proteins and other molecules without the normal enzymatic control used in the body's regulated biochemical processes. It happens naturally throughout life, but the process can become more significant when tissues are exposed to higher levels of reactive sugars over long periods.
The important point is that this is not an overnight process. Glycation is more like gradual molecular wear and tear. Glycation is a biological process that can contribute to changes associated with skin aging, but the precise contribution of ordinary dietary sugar consumption to an individual's wrinkles is difficult to quantify.
From sugar to AGEs
The early products of glycation can undergo further chemical reactions and eventually form compounds known as advanced glycation end products, or AGEs.
What are advanced glycation end products?
AGEs are a broad family of compounds rather than one single substance.
They can form inside the body when sugars react with proteins, lipids and other molecules. They can also be generated during food preparation.
High-temperature cooking methods such as grilling, roasting and frying can promote the formation of AGEs in food. This is one reason researchers distinguish between endogenous AGEs, produced within the body, and dietary AGEs, obtained from food.
However, it would be misleading to equate dietary AGE intake with the amount of AGE damage occurring in someone's skin.
The body is continuously producing and processing these compounds, and their biological effects depend on many factors, including metabolism, kidney function, oxidative stress and overall health.
Why collagen matters
Collagen provides much of the structural framework of the skin. It contributes to its strength, firmness and mechanical properties.
As we age, collagen naturally undergoes changes. Glycation appears to be one factor involved in this process.
AGEs can form cross-links between collagen molecules. These chemical modifications can make collagen stiffer and less flexible, while potentially interfering with normal collagen turnover and remodeling.
Experimental research has demonstrated that glycation can alter the stability, flexibility and assembly of type I collagen.
The proposed pathway looks something like this:
Glucose and other reactive sugars → glycation → AGE formation → collagen modification → changes in tissue stiffness and elasticity
Does eating sugar cause wrinkles?
Not directly. This distinction is important.
There is substantial evidence that AGEs accumulate in skin and that glycation can alter collagen and other components of the extracellular matrix. Reviews of the scientific literature describe glycation as one contributor to cutaneous aging.
However, it would be an overstatement to say:
“Eating sugar causes wrinkles.”
Human skin aging is much more complicated than that.
Intrinsic aging, genetics, ultraviolet radiation, smoking, environmental exposures, hormonal changes, metabolic health and nutrition can all influence how skin changes over time.
A recent 2026 review describes skin aging as multifactorial and identifies glycation and AGE accumulation as important contributors, while also noting that clinical evidence for treatments specifically targeting glycation remains limited.
AGEs don't just affect collagen
Glycation may affect the skin through more than simple collagen cross-linking.
AGEs can interact with cellular receptors known as receptors for advanced glycation end products (RAGE). Activation of these receptors can promote oxidative stress and inflammatory signaling.
This creates another possible pathway through which glycation may contribute to tissue damage and aging.
Recent reviews describe the interaction between AGEs and RAGE as an important mechanism associated with oxidative stress, inflammation and changes in skin function.
In other words, glycation may affect both the physical structure of collagen and the biological behavior of skin cells.
Is a banana the same as a candy bar?
NO.
This is an important point when discussing “sugar” and skin.
A whole piece of fruit contains naturally occurring sugars, but it also contains water, fiber, vitamins, minerals and plant compounds.
A sugar-sweetened beverage, by contrast, can provide a substantial amount of rapidly absorbed carbohydrate with little fiber or nutritional complexity.
So, asking whether a food “contains sugar” isn't necessarily the most useful question.
A better question is:
Should you stop eating sugar for better skin?
Probably not.
The evidence does not support the idea that everyone needs to eliminate sugar completely to preserve youthful skin.
A more sensible approach is to focus on overall dietary quality and metabolic health.
For most people, that means emphasizing:
- Vegetables and fruits
- Legumes and whole grains
- Adequate protein
- Healthy sources of fat
- Fiber-rich carbohydrates
- Minimally processed foods
And limiting excessive consumption of sugar-sweetened beverages and highly refined foods.
The bigger picture
Glycation should therefore be viewed as one piece of the skin-aging puzzle, not the entire explanation.
The science gives us a compelling mechanism connecting glucose exposure with changes in long-lived structural proteins. But that mechanism does not justify the popular claim that every sugary food directly produces a wrinkle.
The more accurate message is both simpler and more interesting:
Sugar doesn't instantly age your skin. But over the long term, glucose-driven glycation can modify the proteins that give skin its structure, while AGE-related signaling may contribute to oxidative stress and inflammation.
That is why researchers continue to investigate glycation as a potential contributor to the aging of skin.
The bottom line
The science behind “sugar and skin” is more nuanced than the headlines suggest.
There is credible biological and experimental evidence that glycation and AGE accumulation contribute to skin aging. Glycation can modify collagen, increase tissue stiffness and interfere with normal protein remodeling. Recent reviews continue to identify glycation as an important component of cutaneous aging, although clinical evidence for interventions specifically targeting glycation remains limited.
There is not enough evidence to conclude that simply eating sugar directly causes wrinkles or that eliminating sugar will reverse skin aging.
The most accurate message is not “sugar destroys your skin.”
It's this:
Long-term metabolic health, diet and glycation can influence skin biology, but skin aging is a complex process that cannot be explained by sugar alone.
References
- Gkogkolou P, Böhm M. Advanced Glycation End Products: Key Players in Skin Aging? Dermato-Endocrinology. 2012;4(3):259–270. doi:10.4161/derm.22028.
- Zheng W, Li H, Go Y, Chan XHF, Huang Q, Wu J. Research Advances on the Damage Mechanism of Skin Glycation and Related Inhibitors. Nutrients. 2022;14(21):4588. doi:10.3390/nu14214588.
- Gautieri A, Passini FS, Silván U, et al. AGEing of collagen: The effects of glycation on collagen's stability, mechanics and assembly. Matrix Biology. 2017/2025 indexed literature. doi:10.1016/j.matbio.2024.12.007.
- The effects of advanced glycation end-products on skin and potential anti-glycation strategies. Experimental Dermatology. 2024. PubMed
- Draelos ZD. Sugar Sag: What Is Skin Glycation and How Do You Combat It? Journal of Drugs in Dermatology. 2024;23(4):SF378083s5–SF378083s10. doi:10.36849/JDD.SF378083.
- Haykal D. Skin Glycomics: Unmasking the Role of Glycation End Products in Cutaneous Aging and Dermatology. Journal of Cosmetic Dermatology. 2026;25(5):e70937. doi:10.1111/jocd.70937.
- Baldwin H, Tan J. Effects of Diet on Acne and Its Response to Treatment. American Journal of Clinical Dermatology. 2021. [Systematic review evidence summarized in subsequent systematic review.]
- Diet and acne: A systematic review. Journal of the American Academy of Dermatology. 2022. PMID:35373155.
- Russo P, Sirangelo I, Siani A. Dietary Advanced Glycation End Products (dAGEs): Pathogenesis and nutritional strategies for health longevity—A critical view. Nutrition, Metabolism and Cardiovascular Diseases. 2026;36(5):104538. doi:10.1016/j.numecd.2025.104538.
- Reddy VP, Aryal P, Darkwah EK. Advanced Glycation End Products in Health and Disease. Microorganisms. 2022;10(9):1848. doi:10.3390/microorganisms10091848.
