Yes, switching to LC generally does effect your TOM. I've only had the one but I've found it much shorter, and PMS was almost non existant (just a day of extreme exhaustion instead of three or four coupled with back aches, head aches, bloating and outlandish cravings).

Theres a good thread on the board concering this topic:

http://forum.lowcarber.org/showthre...&threadid=15285

It should answer a lot of your questions.

Nat