Diet and acne: what the evidence actually says

Patients always ask whether food causes their breakouts, and for years the honest answer was a shrug. The evidence has firmed up enough to say something useful, with caveats.

Two dietary patterns show the most consistent association with acne. High-glycemic diets, lots of sugar and refined carbohydrates, can raise insulin and androgen activity, which feeds oil production. And in some people, dairy (especially skim milk) appears to aggravate acne, likely through hormonal pathways. Chocolate itself, the classic scapegoat, has weak evidence.

The nuance is that diet is a modifier, not a cause. Cutting sugar will not clear severe acne, and no one should chase elaborate elimination diets in place of proven treatment. But for someone already on a good regimen whose skin still simmers, dialing back high-glycemic foods and trying a dairy break for a few weeks is a low-risk experiment that occasionally pays off.

Related reading: Acne is not a hygiene problem and Hormonal acne in adult women.