Hey GenB -
Glad you've stepped out of lurkdom! On the artificial sweeteners, it seems that some people have issues with them, but others do just fine. I'm on the "never caused any problems" side, but you'll get different opinions from others. You have to experiment to see what works best for you.
We have a great 40-somethings forum, so head on over and check it out. You also might like the Featherweights, a group of those with less overall to lose than some of us here...it presents unique challenges!
Again, so glad you're no longer lurking. Can't wait to get to know you better!