原來用乳酸菌醫肚疴應該係not really a new treatment since it has been used for centuries，真係後知後覺。
“One common way to give Lactobacillus is to just feed your child yogurt with live and active cultures, which means that the yogurt contains Lactobacillus bulgaricus and Streptococcus thermophilus. Some brands of yogurt also contain Lactobacillus acidophilus. Although most brands of yogurt do not list the amount of live and active cultures on the label, you can look for brands with the National Yogurt Association’s Live and Active Culture seal, which must contain at least 100 million active cultures per gram. In a 4 ounce pack of yogurt, that should equal about 10 billion colony forming units, so eating 1-2 packs of yogurt a day should be about equivalent to what the children got in most of the studies."