1 Which heavy metal is found in dental amalgam fillings?

• Lead
• Cadmium
• Mercury

  Mercury is a major component of dental amalgam and can release vapors that may reach tissues throughout the body. Learn more.

• Arsenic

2 In high-income countries, which group is more likely to have chronic kidney disease go undiagnosed?

• Toddlers
• Older teenagers
• White men
• Women

  Women may be up to twice as likely as white men to remain undiagnosed even when signs of kidney damage are present. Learn more.

3 What causes the bright yellow urine sometimes seen after taking a multivitamin?

• Unused vitamin C
• Extra magnesium
• Excess riboflavin

  Riboflavin, or vitamin B2, is water-soluble. When the body cannot use all of it at once, the excess is excreted in urine. Learn more.

• Excess calcium

4 Which age group in children may be especially sensitive to mercury vapor from dental amalgam?

• Children younger than 6

  The U.S. Food and Drug Administration (FDA) notes that neurological development is still underway in young children, which may make them more vulnerable to mercury exposure. Learn more.

• Children older than 12
• Teenagers over age 15
• Adults younger than 30

5 Which short-chain fatty acid (SCFA) helps support the intestinal barrier?

• Acetate
• Butyrate

  Butyrate is produced by beneficial gut bacteria and serves as an important fuel source for cells lining the colon. Learn more.

• Lactate
• Citrate

6 How much did pharyngeal cancer risk rise at 40 grams (g) of alcohol per day?

• 56%
• 116%
• 173%

  About 40 g of alcohol per day, or roughly three standard drinks, was linked to a 173% higher risk compared with not drinking. Learn more.

• 240%

7 About 70% of Campylobacter transmission is linked to what food source?

• Poultry products

  A 2025 review published in Microorganisms reported that poultry accounts for about 70% of Campylobacter transmission, especially through raw or undercooked meat. Learn more.

• Dairy products
• Seafood products
• Beef products