The steady stream of holiday cookies and treats may have slowed, but for millions of Americans, the appetite for high-fat, sodium-laden sweets continues. Making the switch from highly processed junk food to healthier whole foods can be challenging. Kate Zeratsky, a Mayo Clinic registered dietitian nutritionist, says making changes in your eating habits can help. French fries, pizza, potato chips and sweets with their added salt, fat and sugar are tasty.