Could be, my dad is lactose - intolerant, but I'd never showed any signs of having issues with dairy until about a year ago. (thepancakeprincess.com)
Milk: As with beef cattle, hormones — used to increase milk production — are a hotly - debated issue with dairy cows, too. (health.com)
I had many issues with dairy over the years, including irritable bowel syndrome and asthma, and there was a time when I avoided it at all costs. (homemademommy.net)