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Related Concept Videos

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Regulation of Metabolism

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Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...
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Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System
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Nutrient timing and metabolic regulation.

Harry A Smith1, James A Betts1

  • 1Centre for Nutrition Exercise and Metabolism, Department for Health, University of Bath, Bath, UK.

The Journal of Physiology
|January 17, 2022
PubMed
Summary
This summary is machine-generated.

Meal timing, or nutrient timing, significantly impacts metabolism and health by aligning with daily circadian rhythms. Understanding when we eat is crucial for dietary guidelines, alongside quantity and quality.

Keywords:
circadianmeal timingmetabolismrhythms

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Area of Science:

  • Chronobiology and Metabolism
  • Nutritional Science
  • Physiology

Background:

  • Daily circadian rhythms coordinate physiology and behavior with environmental changes.
  • Peripheral molecular clocks regulate metabolism, appetite, and energy balance.
  • Meal timing, both absolute and relative, influences metabolic health.

Purpose of the Study:

  • To investigate the impact of feeding-fasting cycle manipulations on metabolism and health.
  • To understand how altering meal timing affects metabolic responses and behavior.
  • To evaluate the significance of nutrient timing in dietary guidelines.

Main Methods:

  • Experimental manipulation of feeding-fasting cycles.
  • Studies involving breakfast omission and alternate-day fasting.
  • Examination of nocturnal feeding patterns.

Main Results:

  • Morning fasting alters metabolic response to later meals and can reduce physical activity.
  • Alternate-day fasting may lead to compensatory reductions in physical activity, hindering weight loss.
  • Nocturnal feeding's impact requires further investigation.

Conclusions:

  • Nutrient timing (when we eat) is as important as nutrient quantity and quality for human health.
  • Dietary guidelines should incorporate recommendations on meal timing.
  • Circadian alignment of nutrient intake is vital for metabolic health.