#545: Carbohydrate Metabolism, Performance & Metabolic Health – Prof. Javier Gonzalez

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Introduction

Carbohydrate metabolism and metabolic health have become central themes in the science of nutrition, with questions about fuel utilization, the impact of different diets, and the potential of ketone supplements driving new research.

As researchers continue to uncover how the body adapts to various energy sources, there are emerging insights into how glucose tolerance, glycogen utilization, and even ketogenic diets influence not only physical performance but also long-term health outcomes.

Understanding how the body responds to different energy sources, particularly in relation to carbohydrate restriction, brings crucial context to popular nutrition strategies and the potential benefits—or trade-offs—they offer.

In this episode, Professor Javier Gonzalez joins to discuss these topics in detail, exploring the latest findings on how dietary choices affect athletic performance, chronic disease risk, and the mechanisms underlying metabolic adaptations.

You will gain insight into topics like reactive hypoglycemia, carbohydrate oxidation, and why individualized responses to diet matter.

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Paper: Ketogenic diet but not free-sugar restriction alters glucose tolerance, lipid metabolism, peripheral tissue phenotype, and gut microbiome: RCT

Timestamps

[01:36]Understanding carbohydrate metabolism
[06:33]The role of glucose in metabolic health
[09:59]Exercise and glucose dynamics
[17:35]Carbohydrate intake and athletic performance
[25:03]Diet impact on exercise and metabolism
[30:44]Pre-workout carbohydrates and reactive hypoglycemia
[35:31]Recent study: Ketogenic diet vs. sugar restriction
[41:09]Future research directions in metabolic health
[45:07]Ketone esters and their role in exercise performance
[49:22]Carbohydrate metabolism and common misconceptions

Hosts

Guest Information

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He earned his BSc (Hons), MRes, and PhD, and is recognized as a Fellow of the Higher Education Academy (FHEA). Since joining the University of Bath in 2014 as a Lecturer, Professor Gonzalez has advanced through the academic ranks, becoming a Senior Lecturer in 2017, a Reader in 2020, and attaining the position of Professor of Nutrition and Metabolism in 2022.

Professor Gonzalez’s research focuses on human fuel utilization, examining how dietary intake influences energy expenditure during exercise and fuel storage when intake exceeds energy requirements. His research group employs methodologies such as indirect calorimetry, tissue biopsies, and stable isotope infusion and ingestion to explore these processes in both laboratory and real-world settings. This work aims to address fundamental scientific questions with practical applications in health and performance.

Javier Gonzalez, PhD

a distinguished academic in the Department for Health at the University of Bath, specializing in human nutrition and metabolism.

Danny Lennon has a master’s degree (MSc.) in Nutritional Sciences from University College Cork, and he is the founder of Sigma Nutrition.

Danny is currently a member of the Advisory Board of the Sports Nutrition Association, the global regulatory body responsible for the standardisation of best practice in the sports nutrition profession.

Danny Lennon

MSc. in Nutritional Sciences from University College Cork

Introduction to this Episode

You will gain insight into topics like reactive hypoglycemia, carbohydrate oxidation, and why individualized responses to diet matter.

Useful Terminology for this Episode

Key Terms & Acronyms

Glycogenolysis: Metabolic process in which glycogen, a stored form of glucose in the liver and muscles, is broken down into glucose-6-phosphate and free glucose. This process helps maintain blood glucose levels, particularly during fasting or physical activity.
Gluconeogenesis: Metabolic pathway by which the liver synthesizes glucose from non-carbohydrate precursors, such as lactate, glycerol, and amino acids. This process is crucial for sustaining blood glucose levels during prolonged fasting or intense exercise.
Continuous Glucose Monitors (CGMs): Wearable medical devices that measure interstitial glucose levels throughout the day. These devices use algorithms to estimate blood glucose levels, offering real-time data for managing glucose fluctuations in both diabetic and non-diabetic individuals.
Atherogenic Lipoproteins: Lipid particles, such as low-density lipoprotein (LDL) cholesterol and apolipoprotein B (ApoB), which contribute to the development of atherosclerosis. Elevated levels of these lipoproteins are associated with an increased risk of cardiovascular disease.
Pyruvate Dehydrogenase Kinase (PDK): Enzyme that regulates energy metabolism by inhibiting pyruvate dehydrogenase activity. This inhibition shifts cellular metabolism toward fat oxidation and away from carbohydrate oxidation, particularly under conditions such as fasting or a ketogenic diet.
Pyruvate Dehydrogenase (PDH): Key enzyme in the metabolic pathway that converts pyruvate into acetyl-CoA, a substrate for the citric acid cycle. PDH facilitates carbohydrate oxidation and energy production, acting as a critical regulator of metabolic flexibility.
Ketone Esters: Nutritional supplements designed to increase blood concentrations of ketone bodies. These molecules serve as an alternative energy source for tissues such as the brain and muscles and may have signaling roles that influence metabolic and physiological processes.
Glycemic Index (GI): A numerical scale that quantifies the rise in blood glucose levels caused by the consumption of a carbohydrate-containing food, compared to a standard reference food, such as pure glucose. Foods with a high GI cause rapid and significant increases in blood glucose, whereas those with a low GI lead to slower, more moderate changes.

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