It's been previously thought that exemestane(Aromasin) had no negative effects on lipids since it worked at disinguaging binding affinity of estrogen, and not aiding in preventing conversion like it's "cousin" anti-e's Arimidex & Letrozole.
Now, I have never seen a study, or blood work showing Arimidex effects lipids, but it has to be a possibilty given it's mechanism of action. It's probably not strong enough in the doses we take(or possibly up to 1mg) for it to produce a drop in HDL. I personally use L-dex specifically because femara has shown to be detrimental to maintaining a healthy HDL level.
I recently found a caption of a study on Pubmed barley mentioning lipid effects with aromasin. I'll be doing some further research on this over the next wk or so to see if I can locate anymore finding pertaining to lipid effect from this particular AI.
If anyone runs across any material which might be helpfull, please contribute.
http://www.ncbi.nlm.nih.gov/entrez/q...&dopt=Abstract