Posted 2/2/2010 6:27 AM (GMT -6)
The simple layman's answer would be - you probably have eaten an offensive food or consumed an offensive beverage.
If this continues, keep a food/beverage/medication/etc. journal. Just any notebook will suffice, keep track of everything you eat, drink, etc. After a while you'll begin to see a pattern form and know which foods to avoid in the future.
The saying - we are what we eat? It's true.