Fat does not make you fat...a surplus of calories makes you fat.
You can use fat to lose fat, however, if you do things correctly by adding EFAs to protein you would accomplish a rise in Glucagon levels which increases fat release from adipocytes. Protein with EFAs (without carbs, or with glycerol) replenish glycogen stores and have a negative impact on the insulin to glucagon balance. THIS IS WHY LBAs ARE SO AWESOME!
Its a fine balance, however, just keep it simple and eat clean, balanced meals.