Katharine Is 55 Years Old and Is Concerned About Changes

Multiple Choice

Katharine is 55 years old and is concerned about changes in her metabolism, muscle mass, strength, bone density, aerobic capacity, blood-sugar tolerance, and her ability to regulate body temperature.Which of the following is her physician most likely to tell her about these changes?

A) They are irreversible in middle adulthood.
B) They can be compensated for by expertise.
C) They can be altered by diet and exercise.
D) They are rarely affected by one's behaviour.