Your question intrigued me, so I went to fitday.com and checked it out. This is what I fiddled with:

Pork rinds

For 2 ounces:

Total Fat 17.84g 27%
Total Carbohydrate 0g 0%
Dietary Fiber 0g 0%
Protein 34.94g 70%

Beef, top sirloin, separable lean and fat, trimmed to 1/4" fat, choice, raw

For 2 ounces:

Total Fat 9.19g 14%
Total Carbohydrate 0g 0%
Dietary Fiber 0g 0%
Protein 10.78g 22%

Kind of makes you go 'hmmmm?' doesn't it?

Your guess is as good as mine in the "Not a significant source of protien" department!

Karen