Summary
Clock genes align metabolic enzymes and hormones with daily feeding and fasting cycles.
In depth
Clock genes in the liver and fat regulate glucose and lipid metabolism. Eating late or shift work disrupts rhythms, increasing diabetes risk. Time-restricted eating is being studied.
Clock genes regulate transcription of metabolic enzymes. Meal timing acts as a clock cue. Disruption raises metabolic risk.
Example: night-shift workers have a higher diabetes risk.
Metabolism follows a 24-hour rhythm. The master clock in the suprachiasmatic nucleus is set by light, while clocks in the liver, muscle, fat and pancreas are strongly entrained by feeding times. Clock proteins (CLOCK, BMAL1, PER, CRY) regulate genes for glucose and lipid metabolism, mitochondrial function and hormone secretion.
Insulin sensitivity is higher in the morning, and melatonin rises at night. Misalignment, as in shift work, jet lag and late eating, impairs glucose tolerance and raises obesity, diabetes and cardiovascular risk. Time-restricted eating aims to align feeding with active hours, with early results in improved markers.
Example: eating the same meal late at night gives a higher glucose peak.
Frequently asked questions
What is Circadian Metabolism?
Clock genes align metabolic enzymes and hormones with daily feeding and fasting cycles.
Which area of biology covers Circadian Metabolism, and how advanced is it?
Circadian Metabolism is one of the 53 topics in Metabolism & Bioenergetics. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Hormonal Control of Metabolism, Metabolic Syndrome, Brown Fat Thermogenesis.
Why does Circadian Metabolism matter?
When we eat matters as well as what.
Can you give an example of Circadian Metabolism?
Glucose tolerance is lower in the evening than morning.
What should I learn before Circadian Metabolism?
Work through the Beginner topics in Metabolism & Bioenergetics first, such as Metabolism, Anabolism and Catabolism, ATP, then return to Circadian Metabolism. Advanced topics assume the Intermediate vocabulary.
What topics are related to Circadian Metabolism?
The closest topics to Circadian Metabolism are Hormonal Control of Metabolism, Metabolic Syndrome, Brown Fat Thermogenesis, Metabolic Pathways Regulation. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Circadian Metabolism?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Circadian Metabolism. To practise the whole of Metabolism & Bioenergetics, use the Metabolism & Bioenergetics quiz.
How is Circadian Metabolism different from Hormonal Control of Metabolism?
Circadian Metabolism: Clock genes align metabolic enzymes and hormones with daily feeding and fasting cycles. Hormonal Control of Metabolism: Insulin, glucagon, cortisol, adrenaline and thyroid hormone coordinate fuel use across tissues. Read both side by side and note what each one explains.
How should I study Circadian Metabolism step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Hormonal Control of Metabolism and explain the difference aloud. Finally, take the Metabolism & Bioenergetics quiz and come back to this page for any question you miss.