High glycemic index foods and sugary processed foods worsen acne by contributing to an inflammatory response that drives sebum production, bacterial growth, and impairs the skin's immune response.

“so we know that high glycemic index foods will make acne worse in almost every study that we've looked at in sugary processed foods will flare your acne there's some component of that inflammatory response that not only drives even production and bacterial growth but actually worsens the Skin's immune response”