Does drinking milk cause pimples?

Under normal circumstances, drinking milk may increase the risk of developing acne, especially with whole milk and skim milk.

Milk naturally contains IGF-1, a hormone that promotes cell growth and differentiation. When milk is consumed, the level of IGF-1 in the bloodstream increases. IGF-1 can stimulate the proliferation and differentiation of sebaceous gland cells, causing the glands to secrete more oil. Excess oil can block hair follicles, providing a favorable environment for the growth of bacteria such as Propionibacterium acnes, thus triggering or worsening acne.

Milk contains certain androgen precursors, such as precursors of dihydrotestosterone (DHT). These precursor substances can be converted into active androgens within the body. Androgens further stimulate the sebaceous glands to secrete oil, leading to clogged pores and an increased likelihood of developing acne. Whey protein in milk promotes insulin secretion. Elevated insulin levels not only affect glucose metabolism but also indirectly impact hormonal balance in the body, causing a relative increase in androgen levels, which in turn stimulates sebaceous gland secretion and triggers acne.

However, it's important to note that not everyone who drinks milk will develop acne; this is closely related to individual genetic background, hormone levels, gut microbiota status, and overall dietary habits. Some individuals may be sensitive to specific components in milk, while others may remain unaffected. Before making any dietary changes, it is recommended to consult a dermatologist or nutrition expert to ensure receiving comprehensive and personalized advice while avoiding malnutrition or other health problems.