Hi M545541,
You do need to pay attention to how much fat you consume whenever you take alli. It will only work on the meal that you take it with. The goal is to reach the amount of fat that was recommended when you signed up. This is usually less than 18 grams of fat per meal. When you go above this you run the risk of a treatment effect. That won't happen for 24 to 72 hours after consuming that meal. They aren't guaranteed to happen, but it's not worth chancing. If you happened to see some oil when you had a bowel movement that is not a TE. The oil can come out separately or mixed in.
Let me know if you have any other questions,
Betty Kovacs, MS, RD