don't eat more than 3 or 4 servings of meat/poultry/fish a week.
That's the first I've heard this "general rule," and frankly it sounds terrible.
Yep, that's really a sufficient amount, and leads to much better health. I'm coming at this strictly from the science, as I just had a lamb burger last weekend, so I love some yummy meat, but red meat does damage the heart, and vegetarians are generally overall much more healthy, have lower rates of heart disease and cancer, and live longer than meat-eaters. Really, a serving of meat every other day is a good general rule, and it's not difficult to follow.