good points. i hadn't really checked out robb wolfs site, so i spent an hour or so last night just reading and reading. and i am ready to get serious! its funny b/c fitness wise - i am sooo happy i found primal. i always thought i was a failure b/c i hated cardio, and running long distance. i was all about heaving lifting and sprints in school. it was so fun for me then, so i am pumped to get back into something i enjoy and don't view as "boring exercise"
I think with grains, and their effects, we need to take a longer term point of view. They are not - in most people - going to have an immediate effect on how we feel. What they CAN effect is how our bodies function and how we feel mentally. And this is where keeping a food/symptom log can be helpful. After my first big cheat (grain-wise) I spent an entire day in a brain fog - my thinking was slow, I wanted to just lay on the couch all day, I even had trouble reading to my son at night because I felt so sleepy. If I hadn't been paying attention, I would have chalked it up to something else - the weather, the travel we'd just completed...but I feel fairly certain it was the grains.
Also, there is are some who believe grains in general, and wheat in particular, effect our total systems. There is a book that just came out called "Wheat Belly", written by a clinical cardiologist. He has seen over and over again in his practice that heart patients who cut wheat have dramatic improvements in their blood work.
I really do think it takes a long time to notice an effect or lack of one with some food stuffs. I really like Robb Wolf's philosophy of trying it STRICTLY for 30 days and evaluate how you look, feel, and perform. Not everything about Paleo is about the immediate effects of foods. In fact, IMO, it's mostly about the long term effects.