What varies with feeding and fasting?

What varies with feeding and fasting?

• A. Proteins
• B. Lipids
• C. Carbohydrates
• D. Nucleic acids

Answer: (C)

Carbohydrates. The availability of glucose derived from dietary carbs changes most clearly with meals: after eating, carbohydrate digestion raises blood glucose and insulin, promoting uptake and storage as glycogen or fat. In a fasted state, hepatic glucose production sustains blood glucose, and the body shifts toward using fats for energy. Lipids and proteins do fluctuate with feeding, but not as directly or rapidly as carbohydrates, and nucleic acids don’t vary with feeding in this way.

Carbohydrates. The availability of glucose derived from dietary carbs changes most clearly with meals: after eating, carbohydrate digestion raises blood glucose and insulin, promoting uptake and storage as glycogen or fat. In a fasted state, hepatic glucose production sustains blood glucose, and the body shifts toward using fats for energy. Lipids and proteins do fluctuate with feeding, but not as directly or rapidly as carbohydrates, and nucleic acids don’t vary with feeding in this way.