Rational eating: can it lead to overweightness or underweightness?

Area of Science:

• Behavioral economics
• Health economics
• Biomedical science

Background:

• Physiologically optimal weight is crucial for health, yet individuals may not maintain it.
• Deviations from optimal weight increase mortality risk.
• Rational agents aim to maximize expected lifetime utility.

Purpose of the Study:

• To investigate the steady-state weight of a lifetime-utility maximizer.
• To analyze the dynamics of weight deviations and their long-term consequences.
• To explore the influence of socio-cultural appearance norms on rational weight choices.

Main Methods:

• Economic modeling of utility maximization.
• Analysis of dynamic systems to predict weight oscillations.
• Incorporation of socio-cultural factors into the utility function.

Main Results:

• The steady state for a utility maximizer is predicted to be overweight.
• Small deviations from this steady state can lead to explosive weight oscillations.
• These oscillations may result in severe underweightness in later life.
• Socio-cultural norms alter the rational stationary weight, lowering it for heavier individuals and increasing it for leaner individuals.

Conclusions:

• Rational decision-making regarding weight may paradoxically lead to suboptimal health outcomes.
• Weight management is a dynamic process influenced by both internal utility calculations and external social pressures.
• Understanding these dynamics is crucial for public health interventions and personalized health advice.