In poor parts of the world, people may rely on a single staple crop to meet a substantial proportion of their energy requirements. For example, those who live in southeast Asia rely heavily on rice.
Most mental health professionals would agree that if one could assign DSM V criteria to elements, zinc's diagnosis would be easy: Code F31.9, Bipolar I disorder, current or recent episode unspecified.
This flu season, one product is making its comeback: orange juice. Sales of OJ seem to have gotten a boost — after years of decline — due to consumers' fears of getting the dreaded illness. 
People swear that popping a few vitamin C tablets when their throat starts to feel sore is a surefire method to prevent a cold.