If you are eating 80/20 lean beef the majority of your calories will be coming from fat.
1 pound of 80/20 ground beef:
~1200 calories
~80g fat @ 9 calories per g = 720 cals or ~60% of calories from fat
~122g of protein @ 4 calories per g = ~500 cals or ~40% of calories from protein
Good luck on your quest for health!