Sweetened blood cools hot tempers: physiological self-control and aggression.

Area of Science:

• Neuroscience
• Psychology
• Criminology

Background:

• Self-control is crucial for regulating aggressive and violent behaviors.
• Brain function, particularly self-control, relies heavily on glucose.
• Impaired glucose metabolism may therefore be linked to reduced self-control and increased aggression.

Purpose of the Study:

• To investigate the hypothesis that low glucose and poor glucose metabolism are associated with aggression and violence.
• To explore the role of glucose in modulating aggressive behavior.

Main Methods:

• Four studies were conducted, employing behavioral experiments, correlational analyses, and examination of population-level data.
• Study 1 involved administering glucose or placebo beverages to participants and measuring subsequent aggression.
• Studies 2-4 examined the relationship between conditions affecting glucose metabolism (diabetes, glucose-6-phosphate dehydrogenase deficiency) and measures of aggressiveness or violent crime rates.

Main Results:

• Consuming a glucose beverage significantly reduced aggressive behavior compared to a placebo.
• Diabetes was indirectly linked to aggressiveness via reduced self-control.
• States with higher diabetes rates exhibited higher violent crime rates.
• Countries with higher rates of glucose-6-phosphate dehydrogenase deficiency showed increased rates of killings.

Conclusions:

• Evidence from four studies supports the link between glucose metabolism and the regulation of aggressive and violent behaviors.
• Maintaining adequate glucose levels and healthy glucose metabolism may be a factor in preventing aggression and violence.