To make a healthy pork roast, first trim any excess fat. Because pork loin is a naturally lean meat, most recipes are healthy as long as they don't add any high fat ingredients.
To trim the fat from a pork loin roast, place the roast on a cutting board, and insert a sharp knife under the layer of fat. Working away from your body, carefully saw the fat away from the meat. Use this method to remove as much of the excess fat as possible.
One healthy recipe for pork loin comes from EatingWell.com and calls for crusting the meat with orange marmalade and pistachio. For this recipe, chop 2 cloves of garlic and 1/3 cup shelled toasted pistachios in a food processor. Season the roast with salt and pepper. Brown the roast on all sides in 1 tablespoon olive oil heated in a large, oven-proof skillet.
Remove the skillet from the heat, and coat the meat with 3 tablespoons orange marmalade. Press the pistachios into the marmalade. Roast for 12 to 16 minutes or until a meat thermometer registers 145 F.
Epicurious.com offers a simple and healthy recipe that calls for coating trimmed pork loin in a garlic and rosemary rub. To make this recipe, combine 4 cloves of minced garlic with 4 teaspoons chopped rosemary, and salt and pepper to taste. Rub the mixture over the pork, and roast for 30 minutes. Turn the roast over, and cook an additional 25 minutes.