63yr old woman, typical American diet, usually have good stools, but have had very soft stools since July of 2013, around the time I ate soup & appetizer at a chain restaurant here in Phx, AZ area. Stools come out very urgently , are very soft, and grainy , and come out in short, narrow sections, about 2 to 3inches each. I seem to be more gassy than usual. Could I have contracted a parasite at the restaurant? Thank you.