Well, it must be due to edema in many cases.... in my case, I dont think so, as it is taking me TONS to get this weight off... darn lyrica ! lol (nah, it helped me a lot...)

http://epilepsy.emedtv.com/lyrica/ly...ight-gain.html

Here is another article talking about this matter.... Shame it is not free. Will download it tomorrow at uni so we can read it complete.

http://www.ncbi.nlm.nih.gov/pubmed/1...ubmed_RVDocSum