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I think that the water issue is much more important here than most people realize. Perdue adds, I believe, upwards of 20% weight to its birds by adding a 'solution', which is usually water or chicken broth. You'll find the presence of a 'solution' in many commercial, prepackaged meats, and I find the untreated meat from local beef, chicken, and lamb to be far more filling than what I buy through supermarkets.
There is also a slightly different fat content in locally raised meats, but the variability can be higher or lower than commercially raised, depending on methods used by individual farmers. Genetic variability is one factor, but so is how the animal is finished. You'll note a totally different quality to meat raised by FFA or 4-H over what you'd see from an animal raised on the rest of a particular farm.
Anecdotal yes, but only because the data on satiety is a very subjective thing. Remember that fat content does, absolutely have a role to play in this, so any meat with a slighty higher fat content, even by as much as .5% percent, can yield a significant change in what people report. (Remember that one of the underlying principles of the Atkins Diet was a higher fat content. Fat shuts off hunger centers and keeps them shut off for longer than fat-free foods.)