A change in guidance has prevented tens of thousands of children from developing an allergy to peanuts.  Until about 10 years ago, parents were advised to delay the introduction of peanuts until about three years of age.  It's now understood that advice actually led to an increase in allergies.  Also, the shingles vaccine could lower the risk of heart attacks and stroke, adding to benefits that go well beyond protection from the virus itself. References Guidelines for Early Food Introduction and Patterns of Food Allergy New systematic review and meta-analysis shows an association between shingles vaccination and lower risk of heart attack and stroke  Shingles (herpes zoster) vaccine - who should get vaccinated?