What is the relationship between CCK levels and meal size?

• A. Higher CCK levels correlate with larger meal sizes
• B. Lower CCK levels correlate with smaller meal sizes
• C. CCK levels have no effect on meal sizes
• D. Increased CCK levels lead to decreased food intake

Answer: (D)

Cholecystokinin (CCK) is a hormone that plays a significant role in digestion and food intake regulation. It is released from the small intestine in response to the presence of fats and proteins in the digestive tract. The increase in CCK levels has been associated with several physiological responses that help signal the body to reduce food intake.

When CCK is released, it acts on the central nervous system to promote feelings of satiety, which leads to a decrease in appetite and ultimately contributes to a reduced food intake. This is a protective mechanism that helps prevent overeating by signaling that the body has received enough nutrients from a meal. Therefore, increased levels of CCK correlate with a decrease in food intake rather than an increase.

In summary, the correct answer aligns with the understanding that elevated CCK levels contribute to the body's signals to limit food consumption, thereby leading to decreased food intake after meals.