Extended periods of inactivity can reduce metabolism and impair the body's ability to
control blood sugar levels, regulate blood pressure and break down what?

The answer is break down fat.

Explanation:

If someone is sedentary and consuming more calories than they are metabolizing, that will result in a slowdown of the body using fat storage for energy and, thereby, impairs the body's ability to break down fat annd produces weight gain.

answer; (false);