INS and acne: Oily fish intake was found to be a protective factor for acne (OR: 0.22, 95% CI: 0.10-0.49, <i>p</i> < .001), and it was also observed that oily fish intake can reduce the level of fasting insulin by the IVW method (OR: 0.89, 95% CI: 0.81-0.98, <i>p</i> = .02).