Of all the recipes in allison fishman task's new cookbook, lighten up, america, her healthier meatloaf was one of the most intriguing. She lightens the loaf in a few ways: first she uses ground sirloin mixed with veal and pork for a leaner meat blend, next she adds whole grain oats instead of bread to bulk out the meat, and then she stirs in a box of wilted baby spinach for color and extra nutrition.