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coming from Kitchengirl, and I happen to agree with her about feeling vastly better or worse depending on what I've eaten, but her attempt at a solution--"don't gain [excess weight] in the first place"--does absolutely nothing to help people who are already overweight.
See--it's easy to make the facile remarks, not that easy to come up with a real, applicable solution, is it? I realize I probably wouldn't be that great at it either (which is why I didn't become a nutritionist), but geez.