Common questions I here are: “Am I eating something that gives me pimples”, “Which foods cause acne” or “Does chocolate cause Acne”?
A recent article evaluating this question stated the following: “Unfortunately, convincing trials are lacking, because it turns out that no meta-analyses, randomized controlled clinical studies, or well-designed scientific trials have followed evidence-based guidelines for providing solid proof in dealing with the issue of Acne and diet”.
In short, nobody knows for sure what the relationship is between Acne and diet. If an Acne patient has elevated insulin levels, low glycaemic index foods might help.
Until this question is answered scientifically, a useful approach is to only exclude foods that you strongly associate with your own Acne flare-ups.