Originally Posted by kazLaJauna

If you don't drink milk with lactose for an extended time, your body stops producing the enzymes needed to digest it. That is what we shouldn't drink milk after being weaned from breast milk. Our bodies are designed to stop digesting the lactose after we stop suckling. When you re-introduce milk back into your diet, it takes weeks for your body to start producing the needed enzymes again. Hence....all the nasty side effects return.