No. I have stayed in the right range for fat grams and have had no effects at all. I actually am more constipated, because I have increased my fiber intake so much and need to add more water. I do pee more too though. I have never felt like I couldn't make it to the bathroom and have never had loose stools. The only time I had more gas was when I ate Fiber One cereal, which is like eating Metamucil! :)
Don't worry. If you follow the guidelines, you'll be just fine! The fear of having those effects helps you to be motivated to not eat too much fat, so that's a good thing. I haven't tested it yet, but I eat 15g of fat per meal, and I'm fine.
Good luck!
Teresa