Does sugar cause acne? A more useful look at glycaemic load

“Cut out sugar and your skin will clear” is an appealingly simple instruction. Skin rarely behaves that simply. Acne involves follicles, oil production, hormones and inflammation. Diet may influence that picture for some people, but a single food is not a diagnosis or a guaranteed cause of a breakout.

Researchers often study glycaemic load, which considers both the type and amount of carbohydrate in a meal or diet. In one 12-week randomised trial involving 43 young men with acne, the lower-glycaemic-load group had a larger drop in total lesion counts than the comparison group. The average reductions were 23.5 and 12.0 lesions respectively [1]. That is an interesting result, but the intervention also changed protein intake and weight. The authors could not isolate the independent effect of glycaemic load from the accompanying weight loss.

The American Academy of Dermatology notes that some studies have found fewer breakouts with a lower-glycaemic approach, while others have not found a clear connection [2]. That mixed picture calls for a practical response rather than food rules. A balanced eating pattern with regular meals, fibre-rich carbohydrates and adequate protein can support general health. Someone who notices a repeatable personal trigger can explore it without assuming everyone needs the same exclusions.

There is a distinction between reducing a very high glycaemic load and fearing all carbohydrates. Fruit, oats, beans and other carbohydrate-containing foods bring useful nutrients and fibre. Restrictive eating, especially in someone already distressed by their skin, can create its own harm without reliably solving acne.

Nutrition belongs in the conversation, but so does appropriate skincare and medical treatment. Diet is one possible influence among several, not a test of discipline or a substitute for a dermatologist when acne is persistent or scarring. That balanced view is more useful than promising that a supplement or a list of forbidden foods will clear every face.

SOURCES

1. Smith et al. (2007), randomised lower-glycaemic-load diet trial: pubmed.ncbi.nlm.nih.gov

2. American Academy of Dermatology, diet and acne patient guidance: www.aad.org

3. American Academy of Dermatology acne guideline (2024): pubmed.ncbi.nlm.nih.gov