Yoghurt as a probiotic is bad simply because it doesn't contain the right mix of gut bacteria. Typically it's a lactobacillus strain, which is present in our gut, but it's only 1 of millions of strains.
But in the stomach, it is my understanding that the bacteria in yogurt can help process the sugars in milk, thus avoiding an excess of sugars in the gut, which might upset the balance of the intestinal flora.
But in the stomach, it is my understanding that the bacteria in yogurt can help process the sugars in milk, thus avoiding an excess of sugars in the gut, which might upset the balance of the intestinal flora.
http://www.nytimes.com/1982/05/05/garden/personal-health-enz...