Energy balance
Mathematical models of human body weight change fall into two distinct classes: those with a unique stable fixed point (where body composition is uniquely determined by energy intake and expenditure) and those with an invariant manifold (where infinite body compositions are possible for the same energy balance).
Understanding your body weight dynamics requires recognizing that simple calorie counting might not predict your exact fat-to-lean ratio. Theoretical models suggest two possibilities: either your body has a unique 'set point' composition for a given diet, or it can settle into many different compositions for the same diet. Current data cannot distinguish between these, implying that factors beyond simple energy balance (like hormonal milieu or substrate preference) may play a significant role in body composition.
We show that the generic dynamic behavior of body composition for a clamped diet can be divided into two classes. In the first class, the body composition and mass are determined uniquely. In the second class, the body composition can exist at an infinite number of possible states.
Why this rating
The paper is a theoretical modeling study; it uses existing data to show insufficiency in distinguishing classes but does not provide new experimental validation of either class.
Source
The Dynamics of Human Body Weight Change
Carson C. Chow et al. · PLoS Computational Biology · 2008
DOI 10.1371/journal.pcbi.1000045
More from this paper
- Standard interventions that alter energy intake or expenditure (diet or aerobic exercise) cannot distinguish between a unique fixed point model and an invariant manifold model because both yield identical mass change trajectories.Moderate
- Distinguishing between unique fixed point and invariant manifold body composition models requires perturbations that directly alter body composition (e.g., resistance exercise, growth hormone) rather than just energy balance.Moderate
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