I bring a yogurt with me to work each day and some days I don't end up eating it until the afternoon (currently eating my warm yogurt now). By this time its fairly room temp but still tastes good (mmmm lemon). I was wondering at what point this habit might get me sick. On a related note, what say you about my theory that ingesting a certain amount of potentially harmful bacteria can actually benefit you by building up your immune system? For example, parents who let their kids play in the dirt etc expose their kids to germs, bacteria, etc. These kids may get sick initially, but will build up an immune system capable of defending against sickness later. These kids would have a better defense against various illnesses than say, kids whos parents never let them leave the house/ play on the floor for fear of germs.