Hey, I did read Ultrametabolism and I remember liking it - but it's been awhile. If you're looking for a healthy, whole foods salad dressing, you can easily make your own (tons of great recipes on the web). I like Annie's Gingerly Vinaigrette (organic, low calorie, low fat).
I can't answer the rest of your questions based on Ultrametabolism, but for me - I put the occasional splenda in my coffee, I drink the occasional diet soda and it hasn't stopped me from losing weight or keeping it off.
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