Change: much, and what kind," he said. Evidence suggests the bugs need to be alive and ingested in huge amounts, generally between 5 billion and 10 billion daily, he said. While some products claim to have more, he said it's uncertain whether more is better. http://news.yahoo.com/s/ap/20071210/ap_on_he_me/diet_friendly_bacteria   View changes from previous version. (Word count: 1096)

Change: _A Canadian study published last month suggested that fermented milk containing Lactobacillus acidophilus and Lactobacillus caseii could help prevent antibiotic-related diarrhea. _A study from Finland   View changes from previous version. (Word count: 3158)