Dairy consumption has been implicated in acne development through mechanisms involving insulin and insulin-like growth factor-1 (IGF-I). Dairy whey elevates insulin, while casein increases IGF-I, both of which enhance access to androgen receptors, contributing to follicular blockage. Epidemiological studies, including large cohorts from the U.S. and Norway, show a positive correlation between milk, especially skim milk, and acne. Milk consumption triggers postprandial insulin and IGF-I surges, promoting sebaceous lipogenesis and inflammation, key factors in acne pathogenesis. The milk-entero-pituitary axis, through GIP stimulation, also boosts growth hormone (GH) and IGF-I levels. Furthermore, dairy-derived hormones and bioactive compounds can affect endocrine pathways involved in acne, with both gender and dietary differences influencing outcomes. While low-fat dairy has often been associated with acne, recent findings suggest a stronger link with full-fat dairy. Studies from various countries also indicate other dietary factors, like chocolate and chips, are linked to acne. The exact bioactive components in dairy responsible for these effects remain unclear, highlighting the need for more research.