I don't have a good enough understanding about human physiology to give a satisfactory answer on exactly by what mechanism saturated fat messes you up by. But if you're looking for more evidence for my claim that it is unhealthy, have a look at the following videos. Each has citation links to direct papers you can read to understand this subject further.

http://nutritionfacts.org/video/the-saturated-fat-studies-se...

http://nutritionfacts.org/video/the-saturated-fat-studies-bu...

http://nutritionfacts.org/video/trans-fat-saturated-fat-and-...