What two vitamins famous for their roles in cell reproduction are needed in increased amounts during pregnancy?  

What is the maximum length of the human lifespan?  

What is the recommended duration of exclusive breastfeeding, according to the American Academy of Pediatrics?  

Why does administering leptin fail to reverse the majority of obesity cases?  

The majority of evidence supports a role for fiber-rich diets as protective against what type of cancer?  

Which vitamin supplement is known to cause malformations of a fetus?  

Research indicates increasing dietary protein may maintain muscle mass and function in older people.  

What trace mineral is essential to sperm production and taste perception, and assists in immune function?  

Which characteristic is LEAST likely to apply to a fat-soluble vitamin?  

Among U.S. children, which deficiency is prevalent due to inadequate intakes?