Anecdotal: the weight lifters / body builders I know say less carbs and more protein is helpful to their goals, and they say that paleo and/or Atkins is something to cycle through and not adopt as a lifetime diet. Three months of less carbs and more protein, three months of something else, three months of etc.,then if needed or desired three months back to less carbs and more protein. That time limit is something I see lacking in most discussions on the topic, and if I hadn't been told directly I wouldn't have known either.

Anecdotal: met a guy once who said he'd lost a large amount of fat quickly and kept it off using Atkins. He had adopted it as a lifetime diet.

Anecdotal: if I eat somewhat less bready stuff, I've got more pep in my step.

These anecdotal facts are large-percentage true and small-percentage applicable to anyone else. Look ma, I'm learning to speak Bayesian!