[24] Fasting and Thermogenesis Flashcards
What is the relationship between fasting and thermogenesis?
Fasting triggers adaptive thermogenesis to conserve energy.
What is adaptive thermogenesis?
A process where the body adjusts its metabolic rate in response to changes in energy intake or temperature.
How does fasting affect thermogenesis?
Fasting may decrease thermogenesis to conserve energy.
What is the role of brown adipose tissue (BAT) in fasting-induced thermogenesis?
During fasting, BAT activity decreases, reducing heat production.
What is BAT?
BAT stands for Brown Adipose Tissue.
How do hormones influence thermogenesis during fasting?
Levels of hormones such as thyroid hormones and leptin that stimulate thermogenesis decrease during fasting.
How does the body compensate for the reduced energy intake during fasting?
By decreasing the metabolic rate and conserving energy, including reductions in thermogenesis.
Can fasting impact the thermic effect of food (TEF)?
Yes, fasting can reduce TEF, contributing to a lower metabolic rate.
What is TEF?
TEF stands for Thermic Effect of Food.
What is the Thermic Effect of Food (TEF)?
It’s the increase in metabolic rate after ingestion of a meal.
Does fasting affect shivering and non-shivering thermogenesis differently?
Yes, both can decrease during fasting, but non-shivering thermogenesis, primarily driven by BAT, is often more affected.
What happens to thermogenesis when fasting ends and refeeding begins?
Thermogenesis typically increases during refeeding, contributing to the postprandial increase in metabolic rate.
Can fasting lead to long-term changes in thermogenesis?
Prolonged fasting can result in a persistent reduction in thermogenesis, contributing to energy conservation.
How does fasting influence thermogenesis in terms of weight loss?
The decrease in thermogenesis during fasting can slow down weight loss as the body conserves energy.
What impact does fasting have on cold-induced thermogenesis?
Fasting may decrease the capacity for cold-induced thermogenesis due to reduced BAT activity.
What role does leptin play in fasting and thermogenesis?
Leptin levels decrease during fasting, leading to reduced thermogenesis.
What is leptin?
Leptin is a hormone that regulates energy balance by inhibiting hunger.
How does intermittent fasting affect thermogenesis?
Intermittent fasting can lead to temporary reductions in thermogenesis during fasting periods.
How does fasting influence thermogenesis in muscle tissue?
Fasting may decrease thermogenesis in muscle tissue as part of overall energy conservation.
What effect does fasting-induced thermogenesis have on the overall metabolic rate?
It decreases the overall metabolic rate to conserve energy.
