Which of the following is true about acute and chronic disease? A)

Chronic diseases appear rapidly, while acute diseases are always present in a population.

B)

Acute diseases appear, decline or disappear, then never reappear.

C)

Acute diseases are rare.

D)

Chronic diseases affect a large percentage of a population while acute diseases only affect a small percentage.

E)

Acute diseases remain fairly constant in a population.

What calculation estimates the primary macronutrient the body uses for energy at a given point in time?