1 Which growth factor helped restore brain fluid drainage in older mice?

• Brain-derived neurotrophic factor (BDNF)
• Epidermal growth factor (EGF)
• Vascular endothelial growth factor C (VEGF-C)

  Vascular endothelial growth factor C (VEGF-C) stimulated the growth of drainage vessels, allowing fluid outflow in older mice to return to levels seen in younger mice. Learn more.

• Insulin-like growth factor 1 (IGF-1)

2 How may self-compassion help after a health-related lapse?

• Reduce the need for a routine
• Build confidence to keep going

  People who responded to setbacks with self-compassion reported greater confidence and a stronger intention to keep going. Learn more.

• Create stricter daily habits
• Prevent future lapses entirely

3 What does biological age reflect?

• The condition of your cells, tissues, and organs

  Biological age estimates how well your body is functioning, while chronological age simply counts the years you have lived. Learn more.

• The number of years since you were born
• Your family history of chronic disease
• Your average amount of daily exercise and calorie intake

4 Which drying methods preserved more nutrients than conventional hot-air drying?

• Sun-drying and air-drying
• Smoking and oven-drying
• Freeze-drying and radiant energy vacuum drying

  Freeze-drying and radiant energy vacuum drying preserved more vitamin C and beta-carotene, while conventional hot-air drying caused much greater nutrient losses. Learn more.

• Microwave-drying and pan-drying

5 Which non-stimulant ingredient has strong evidence for improving strength?

• Creatine

  Creatine helps regenerate adenosine triphosphate (ATP), giving muscles rapid energy for activities such as lifting and sprinting. Learn more.

• Taurine
• Citrulline
• Glutamine

6 Which fruit is surprisingly rich in flavanols?

• Bananas
• Plums

  Plums are especially rich in flavanols, with about four medium plums providing an estimated 450 milligrams. Learn more.

• Watermelons
• Cantaloupes

7 How many different sirtuins does the human body have?

• Three
• Five
• Seven

  There are seven sirtuins with specialized roles in different parts of the cell, including DNA maintenance, metabolism, and mitochondrial energy production. Learn more.

• Nine