And now the downside
One of dairy’s biggest negatives? The stomach problems it causes. Ninety-eight percent of Southeast Asians, 90 percent of Asian Americans, 79 percent of African Americans, and 5 percent of Europeans have trouble digesting it because they’re intolerant of lactose, the type of natural sugar that milk and other dairy products contain, according to the University of California, Davis. As a result, they end up with gas, cramps, bloating, nausea, or diarrhea when they consume it.
Acne is another major concern for many women, who say they break out when they eat dairy. While there hasn’t been a definitive study proving that dairy causes pimples, a growing volume of research suggests there’s a link, according to a review in Practical Dermatology. The culprit may be hormones, milk proteins, and/or growth factors in dairy that can cause the skin to produce more oil, leading to breakouts.