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PODCAST

Metabolism Made Easy

A J Ghalayini, Ph.D.

This podcast describes selected biochemistry content that could be useful to premedical/medical students. Similar content (podcasts and videos) is available at: https://medbiochem.org/ Check out my podcast on YouTube below: https://youtube.com/playlist?list=PLXy2KYiCd9rlg0JmfA392WrEiOYNu39xn&si=Nu2LkpYOjHPZpxd5 These podcasts and videos cover selected topics in medical biochemistry. A J Ghalayini, Ph.D. Bio for Dr. Ghalayini: Dr. Ghalayini received his Ph.D. in Biochemistry from the

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All Episodes

00:05:18

Outcome of Vitamin B12 Deficiency: Homocysteinemia...

Metabolism Made Easy ·

2026/04/08

This podcast transcript explains how a **vitamin B12 deficiency** disrupts the essential recycling of **folate** within the body. When B12 levels are insufficient, folate becomes permanently stuck in its **methylated form**, a phenomenon often referred to as the **folate trap**. This chemical blockage prevents the creation of other active folate types necessary for **DNA synthesis** and amino acid processing. Consequently, the lack of these vital compounds leads to serious health issues such as

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00:02:59

The Methionine Hub: Vitamin B12, Tetrahydrofolate,...

Metabolism Made Easy ·

2026/04/01

This podcast details the physiological importance of **methionine**, an **essential amino acid** that humans must obtain through their diet. It serves as a critical **building block for protein synthesis**, acting as the starting signal for translating genetic code in all living organisms. Beyond its role in structures, it functions as a **precursor to cysteine** and generates **S-adenosylmethionine**, a vital molecule used for transferring methyl groups in biological reactions. The podcast also

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00:18:23

The Hidden Life of Fatty Acids

Metabolism Made Easy ·

2026/03/28

This podcast explains how the human body acquires and utilizes fatty acids through three primary channels: dietary intake, internal synthesis, and the breakdown of stored fats. While most fats come from the food we eat, the liver and adipose tissue can also create them using specific precursors and enzymes. Once available, these molecules serve as a critical energy source through a process called beta-oxidation, especially during periods of fasting. Beyond fuel, fatty acids are fundamental building

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00:02:19

Fat Metabolism: 2 Playbooks

Metabolism Made Easy ·

2026/03/25

Triacylglycerol is the universal fat source in dietary fat and stored fat in adipose tissue. It provides energy by releasing fatty acids that can be metabolized by beta oxidation to generate energy. There are 2 distinct strategies at work during the well-fed state and the fasting state that release fatty acids from Triacylglycerol. These strategies are regulated by hormones and involves the activation of specific lipases in the process.

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00:02:59

Nucleotides: The Ultimate Cellular Multitaskers

Metabolism Made Easy ·

2026/03/17

Nucleotides have at least 5 essential cellular roles. One of the most important roles is that they are the building blocks of DNA and RNA, thus affecting cellular growth and proliferation. Enzymes involved in nucleotide biosynthesis are therapeutic targets for several drugs including anti-microbial, anti-viral and anti-cancer drugs.

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00:06:22

The Liver's Cholesterol Dance: Statins & Plasma...

Metabolism Made Easy ·

2026/03/12

This educational content details how the liver regulates cholesterol through both its internal production and the absorption of particles from the bloodstream. When a patient takes statin medications, the drug blocks a specific enzyme to inhibit cholesterol synthesis within liver cells. This internal shortage triggers the liver to increase its production of surface receptors designed to capture low-density lipoprotein (LDL) from the blood. Consequently, these extra receptors effectively pull more

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00:03:00

Lipolysis, Beta-oxidation and Ketogenesis

Metabolism Made Easy ·

2026/03/06

Lipolysis in adipose tissue is initiated by activation of Hormone-Sensitive Lipase by epinephrine during fasting. The fatty acids released in the bloodstream provide an alternative fuel source for other tissues like the liver and muscle. This switch to using fatty acids for energy spares glucose use during fasting. In addition, excess acetyl CoA in the liver is used to produce ketone bodies that can serve as an alternative energy source for many tissues.

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00:16:20

INSULIN: Orchestrating The Fed State

Metabolism Made Easy ·

2026/02/28

Following a meal, the pancreas releases insulin to manage elevated blood sugar levels by altering how various tissues process nutrients. This hormone primarily targets the liver, muscles, and fat cells to encourage the storage of energy while preventing the release of internal fuel reserves. Specifically, insulin facilitates the movement of glucose from the bloodstream into cells via specialized transporters and promotes the synthesis of glycogen and fats. Simultaneously, it halts processes like

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00:11:51

The 3 Stages of Catabolism: How food is converted to...

Metabolism Made Easy ·

2026/02/23

Metabolism involves a structured three-stage breakdown of nutrients to provide the body with energy. The initial phase takes place in the digestive tract, where complex foods like proteins and fats are reduced to their basic building blocks before entering the blood. During the second stage, these smaller units travel into cells to be processed within the cytoplasm and mitochondria, creating high-energy molecules through pathways like glycolysis and the TCA cycle. The final phase occurs deep inside

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00:09:38

Dietary Fat: The Lifecycle of Triacylglycerol @...

Metabolism Made Easy ·

2026/02/17

Triacylglycerol, the major (90%) dietary fat is processed specifically by 3 distinct lipases with 3 distinct compartments, resulting in digestion, absorption, reassembly, transport and uptake by tissues. During fasting, lipoprotein lipase mobilizes stored triacylglycerol in adipose tissue, releasing fatty acids to the bloodstream and providing an alternative energy source for several tissues.

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00:02:59

Nitrogen Disposal & Carbon Skeletons- AI Podcast

Metabolism Made Easy ·

2026/02/10

The body cannot store excess amino acids, so they are used for protein synthesis or energy. During catabolism, nitrogen is converted into toxic ammonia, which the urea cycle safely removes. Remaining carbon skeletons are repurposed for fuel by producing glucose or acetyl CoA which are both catabolized to produce energy.

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00:02:59

Glycolysis Summary: 5 Key Features

Metabolism Made Easy ·

2026/02/07

This podcast summarizes 5 key features of glycolysis: 1. Purpose of glycolysis ; 2. Tissues and Cellular compartments; 3. Energy output; 4. Regulation of rate-limiting enzymes; and 5. Clinical correlates (pyruvate kinase are deficiency).

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00:14:30

Pyruvate: Distinct Roles During Fasting/ Well-Fed...

Metabolism Made Easy ·

2026/01/27

This podcast explains how the human body adapts its metabolic pathways to manage pyruvate based on its nutritional status. In the well-fed state, high glucose levels allow pyruvate to fuel the TCA cycle for energy or assist in creating nonessential amino acids. Conversely, during fasting or physical exertion, the body shifts toward gluconeogenesis to synthesize new glucose from available resources. This process involves converting substances like lactate and alanine from the muscles back into

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00:02:59

8 Enzymes Regulated by Insulin

Metabolism Made Easy ·

2026/01/19

Insulin binding to its receptor initiates a cascade of intracellular events that lead to the activation of a phosphoprotein phosphatase. This phosphatase will dephosphorylate 8 distinct enzymes involved in carbohydrate and lipid metabolism and change their activity, thus changing the overall metabolism of carbohydrates and lipids.

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00:02:59

Allosteric Regulation of Enzymes

Metabolism Made Easy ·

2026/01/11

In this short, the effect of allosteric effectors on enzyme kinetics is covered in some detail including the effect of allosteric effectors on either Vmax or the the enzyme's affinity for its substrate.

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00:10:37

INSULIN: A Master Builder

Metabolism Made Easy ·

2026/01/02

This podcast explains how elevated blood sugar levels trigger the release of insulin, a vital hormone that interacts with various body tissues. Once activated, insulin receptors initiate several internal processes designed to store energy and build cellular components. Specifically, this hormone facilitates anabolic reactions, which include converting glucose into glycogen and transforming fatty acids into triglycerides. Additionally, it plays a crucial role in protein synthesis by utilizing

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00:09:53

Glycogen Summary: Liver vs Muscle

Metabolism Made Easy ·

2025/12/23

This podcast summarizes glycogen metabolim hidhlighting some of the major differences between liver and muscle glycogenolysis. In addition, allosteric and hormonal regulation of glycogenolysis in both tissues are covered in detail.

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00:10:49

Understanding Metabolism

Metabolism Made Easy ·

2025/12/16

This podcast provides a detailed overview of metabolism, defining it as the complete set of cellular processes essential for survival, which are categorized into catabolic (energy-producing breakdown) and anabolic (energy-consuming synthesis) pathways. It emphasizes that metabolic regulation is heavily dependent on three main factors: hormone levels (particularly insulin and glucagon from the pancreas), the availability of substrates in the bloodstream, and input from the nervous system. The text

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00:02:59

Catabolism of D/L Amino Acids

Metabolism Made Easy ·

2025/12/13

In nature, amino acids exist as two distinct isomers, designated D and L Isomers. These mirror images of one another are metabolized differently in the cell. Only L isomers are used in cellular protein synthesis. Most catabolic enzymes metabolize L-isomers only while D-isomers are metabolized by D-Amino acid oxidase.

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00:03:00

FAT: The most Abundant Energy Depot in The Body - AI...

Metabolism Made Easy ·

2025/11/28

This YouTube video transcript from "Metabolism Made Easy" highlights the significant role of fat reserves in the human body. The speaker emphasizes the substantial quantity of fat, primarily in the form of triacylglycerols (TAGs), stored within us. This reserve represents a considerable percentage of body mass and, crucially, an enormous energy depot. The transcript points out that the caloric potential of fat far surpasses that of both protein and glycogen, making it the body's most important

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223 results

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