As I understand it, a protein snack is half the meal size portion. I like the turkey bacon cooked up crispy as a snack. I don't want to use my whole package too fast (and I get lots of enjoyment out of a little), so I usually do 1/2 turkey bacon, 1/2 microwaved, salted and peppered egg whites when I have it (but if going out would do just turkey bacon or turkey bacon and hard boiled egg whites).

I believe we're supposed to try to avoid sugar in jerky as well (though I think I saw her comment that if that was the only nitrate free kind someone could find, she might let a tiny bit of sugar slide).

It's really pretty simple if you follow the book guidelines and use a food scale (very inexpensive and easy to find). 4 oz of meat or 6 oz of fish is 1 serving. Meat is meat whether it's turkey bacon, chicken breast or ground buffalo. Once you measure portions a couple of times, you can keep a list (for example how many strips of bacon or how many pieces of jerky = 1 serving). I also have a couple of small bowls I use where I know 1/2 full is a 1/2 cup, full is 1 cup and heaping is 1 1/2 cups. I use them for oats & grains.