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Differences in fairness and trust between lean and corpulent men.

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Economic decisions are influenced by body weight and blood glucose levels. These factors may explain employment disparities between lean and corpulent individuals, highlighting a potential weight bias in decision-making.

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Area of Science:

  • Behavioral Economics
  • Neuroeconomics
  • Psychology

Background:

  • Employment disparities exist between lean and corpulent individuals, with corpulent people facing hiring and wage disadvantages.
  • The underlying reasons for these weight-based disparities in employment are not fully understood.
  • Hypotheses suggest differences in economic decision-making influenced by blood glucose and opponent's body weight.

Purpose of the Study:

  • To investigate how body weight and blood glucose concentrations affect economic decision-making.
  • To determine if perceived opponent body weight influences economic choices.
  • To explore potential links between these factors and employment disparities.

Main Methods:

  • 20 lean and 20 corpulent men participated in economic games (ultimatum, trust, risk).
  • Experiments were conducted under euglycemic and hypoglycemic conditions using the glucose clamp technique.
  • Decision-making was analyzed based on participant weight, opponent weight, and glucose levels.

Main Results:

  • In the ultimatum game, lean men offered less during euglycemia (P=0.042).
  • Hypoglycemia led to acceptance of smaller amounts across groups (P=0.031), indicating more 'Homo Economicus' behavior.
  • Lean men favored lean trustees over corpulent ones during hypoglycemia in the trust game (P<0.001).

Conclusions:

  • Economic decision-making is significantly affected by an individual's body weight and their perception of an opponent's body weight.
  • Blood glucose concentration is a crucial factor influencing economic choices.
  • Weight bias in economic decision-making may contribute to observed employment disparities.