Despite all the health benefits milk has, in some cases, its intake can lead to undesirable consequences. That is:

Milk can worsen acne. A meta-analysis of 14 studies reports that dairy consumption may increase the risk of acne in people between the ages of 7 and 30. However, the authors of the study say that a clear connection between milk intake and the appearance of acne has not been established and the results should be interpreted with caution due to the heterogeneity of the initial data.
It can cause allergies. The World Health Organization estimates that 1.9% to 4.9% of children are allergic to cow’s milk protein. Though, most often, it manifests itself during the first year of life, still, the reaction can appear at any age. For example, adults can develop allergies to dairy products even if they have been consuming milk without any issues before. Allergy symptoms include itching, redness of the skin, abdominal pain, tingling or swelling of the lips, tongue, or throat, runny nose, and watery eyes. If they appear, you need to urgently consult a doctor.
It can cause lactose intolerance. There a widespread issue with digestion when a body cannot digest lactose — a type of sugar that milk and dairy products contain. This condition can develop at any age — many cases are first recorded in people from 20 to 40 years old. Symptoms usually appear within several hours after consuming dairy products and include bloating and bowel discomfort. Just like in the situation with allergies, you should consult your doctor if you suspect that you have a lactose intolerance.

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