Concepts
Caloric Balance
Also Known As Energy Balance
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The relationship between energy consumed through food and energy expended through metabolism and activity, whose net direction over time drives weight gain, loss or maintenance. It is a simplifying model rather than the whole account of body weight regulation, which also involves hormonal and genetic factors the field continues to study.
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Open Questions (1 open question)
Does the carbohydrate-insulin model correctly reverse the causal direction of the energy balance model, so that hormonally driven fat storage causes overeating rather than overeating causing fat storage?
The mainstream energy balance model treats a caloric surplus as the cause of fat gain. The carbohydrate-insulin model, argued most fully by David Ludwig and colleagues in a 2021 American Journal of Clinical Nutrition paper, proposes the reverse: that a shift in substrate partitioning toward fat storage, driven by the insulin response to dietary carbohydrate, itself creates the positive energy balance rather than following from it. Kevin Hall and other researchers have published data its authors say falsifies the carbohydrate-insulin model, proponents disagree that the tests were decisive, and systematic reviews have not found the long-term weight-loss advantage for low-carbohydrate diets the model would predict.
What would resolve this Controlled metabolic ward studies isolating substrate partitioning and hunger signaling from calorie intake, replicated across research groups holding competing positions, with pre-registered outcome measures both camps accept in advance.
Nutrition science, endocrinologyWikipedia: Carbohydrate-Insulin Model
Dissenting Readings (1 dissenting reading)
Description
Proponents of the carbohydrate-insulin model argue that framing body weight regulation as a simple caloric balance restates a principle of physics without explaining the biology: they hold that a shift in substrate partitioning toward fat storage, driven by dietary carbohydrate and the insulin response to it, is what drives a positive energy balance, reversing the usual causal direction rather than merely restating it.
A dissenting reading, from David Ludwig and colleagues (carbohydrate-insulin model proponents)Wikipedia: Carbohydrate-Insulin Model, Wikipedia
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