Several studies have found that milk (regardless of the fat content) is associated with increased acne. One reason could be growth hormones that naturally occur in milk, says Logan. “Eighty to 90 percent of milk is derived from pregnant cows and the researchers are starting to find that the natural growth hormones are stimulating the acne process,” he explains. In fact, all dairy products except yogurt have been shown to raise the risk for breakouts. So if you’re acne prone, Logan recommends cutting back on the milk products you eat.
“Experiment with total elimination [of dairy products] for about three weeks, then slowly reintroduce yogurt,” he suggests. The reason yogurt won’t give you zits: the fermentation process eliminates about 80 percent of naturally occurring growth hormones, Logan says.