The carbohydrate-insulin model: a physiological perspective on the obesity pandemic

Summary

This paper, authored by a multidisciplinary group of obesity researchers and clinicians, presents a detailed physiological case for the carbohydrate-insulin model (CIM) of obesity, arguing that high dietary glycaemic load promotes insulin secretion, which in turn directs metabolic fuel towards fat storage rather than oxidation. The authors contend that this hormonal mechanism may better account for the drivers of the obesity pandemic than the prevailing energy-balance ('calories in, calories out') paradigm. The paper is likely to be a significant contribution to ongoing academic debate about the primacy of dietary carbohydrate quality and quantity in weight regulation, though it should be noted that the CIM remains contested and the evidence base is not uniformly accepted.

UK applicability

The arguments presented are directly applicable to UK public health policy, particularly given ongoing debates around ultra-processed food consumption, dietary guidelines, and obesity strategy; the CIM framework has implications for how UK dietary advice around carbohydrate and sugar intake might be evaluated and revised.

Key measures

Insulin secretion; dietary glycaemic load; body fat accumulation; energy partitioning; hormonal responses to macronutrient composition

Outcomes reported

The paper examines how dietary carbohydrate intake and the resulting insulinaemic response may drive fat storage and contribute to obesity, contrasting this mechanistic framework with the conventional energy-balance model. It evaluates physiological and epidemiological evidence in support of the carbohydrate-insulin model as an alternative explanatory framework for the obesity pandemic.

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