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The Twin Cycle Hypothesis of type 2 diabetes aetiology: From concept to national NHS programme

Lookup NU author(s): Professor Roy Taylor

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2025 The Author(s). Experimental Physiology published by John Wiley & Sons Ltd on behalf of The Physiological Society.The development of magnetic resonance methods for quantifying intra-organ metabolites has permitted advances in the understanding of fasting and post-prandial carbohydrate and lipid handling in people with and without type 2 diabetes. Insulin resistance in the liver was shown to be related to excess intra-organ fat and was able to be returned to normal by weight loss. The practical effect of having muscle insulin sensitivity in the lower part of the wide normal range resulted in the obligatory shunting of carbohydrates via de novo lipogenesis into saturated fat. These observations provided the basis for the Twin Cycle Hypothesis of the aetiology of type 2 diabetes. Subsequent studies on people with type 2 diabetes confirmed the postulated pathophysiological abnormalities and demonstrated their reversibility by dietary weight loss of 10–15 kg. Overall, the fundamental understanding of the mechanisms causing type 2 diabetes has bridged physiological and clinical perspectives. Large population-based randomised controlled trials confirmed the practical clinical application of the method of achieving substantial weight loss, and an NHS programme is now in place offering potential remission to people within 6 years of diagnosis.


Publication metadata

Author(s): Taylor R

Publication type: Review

Publication status: Published

Journal: Experimental Physiology

Year: 2025

Pages: epub ahead of print

Online publication date: 03/02/2025

Acceptance date: 13/01/2025

ISSN (print): 0958-0670

ISSN (electronic): 1469-445X

Publisher: John Wiley and Sons Inc

URL: https://doi.org/10.1113/EP092009

DOI: 10.1113/EP092009


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