Question

Research now shows that people on average experience a ______________ decline in their rest metabolic rate with each passing decade after the age of 25.

a) Gradual
b) Sudden
c) Stable
d) Variable

Answer 1

Research shows that people experience a gradual decline in their rest metabolic rate with each passing decade after the age of 25. The decline is primarily due to changes in body composition and reduced muscle mass. This decrease in metabolic rate creates a positive-feedback system that further reduces muscle mass.

Step-by-step explanation:

Research shows that people on average experience a gradual decline in their rest metabolic rate with each passing decade after the age of 25. The human body's metabolic rate decreases nearly 2 percent per decade after age 30. This decrease is primarily due to changes in body composition, such as reduced lean muscle mass. The most significant decline in metabolic rate occurs between the ages of 50 and 70.Loss of muscle mass is responsible for the decline in metabolic rate. Reduced strength resulting from muscle loss inhibits seniors from engaging in sufficient physical activity, which further reduces their metabolism. This creates a positive-feedback system where reduced physical activity leads to even more muscle loss.