A Penn State University study found that adding such herbs and spices as oregano, cinnamon, turmeric, black pepper, cloves and garlic powder to meals significantly upped post-meal blood levels of antioxidants, lowered insulin levels and reduced unhealthy blood fats by a 30 percent. Other research shows that such natural seasonings can also boost satiety and rev up metabolism. Many herbs and spices are even more potent sources of antioxidants than fruits and vegetables. To harness their power, sprinkle a little into each meal.