During the fasting phase,most of the energy used by muscles is derived from
A) glucose.
B) free fatty acids released from adipose tissue.
C) glycogen.
D) amino acids.
E) ketones.

Question

Quizplus · Accepted Answer

During fasting, the body shifts from using glucose for energy to using free fatty acids released from adipose tissue. This process is known as lipolysis and results in the production of molecules called ketones, which can be used by the body as an alternative fuel source. This is why low-carbohydrate diets, which promote ketosis, have become popular for weight loss. Glycogen stores are depleted during fasting, so glucose is not a primary source of energy during this phase. Amino acids may be used by the body for energy if other fuel sources are insufficient, but this can lead to muscle breakdown and is not an optimal energy source.

During the Fasting Phase,most of the Energy Used by Muscles