Heidi, that's really strange about your friend.
I know I've read about this friend in your thread before, but I don't remember, did she start with another technique and THEN switch to noseclipping? How long after her switch did she decide SLD wasn't working? How did she do on the oil or other method?
I think it all boils down to that "if it ain't broke, don't fix it" thought. Its funny, I started on oil, but was using ELOO which made me sick, then sugar water which did nothing, then switched to CO, which didn't really do much for me, then I was noseclipping a shake with oil added for extra FF calories, then I experimented with xylitol. But now I'm back to just straight oil (canola this time) for the last 4 months or so, and its been working wonderfully for me. I wish I had started on Canola, because the only reason I stopped using ELOO is because it made me sick. But its amazing how sometimes all it takes is a return to a simpler method and you restart the SLD method.
What I do find troubling, though, is the reports of people having regained the weight they lost. I worry constantly that I'll see my goal weight, and then quickly gain everything back. I wonder if the people who regain are still trying to adhere to SLD or if they are simply reaching their goal weight and settling back into old habits?