[Associations between Social Isolation, Loneliness, and Addiction]

Area of Science:

• Public Health
• Behavioral Science
• Neuroscience

Background:

• Social isolation and loneliness are linked to premature mortality, highlighting their public health significance.
• Animal studies indicate adolescent social isolation increases alcohol consumption in males, with less effect in adults.
• Human studies show mixed associations between loneliness and alcohol use, with some linking greater loneliness to alcohol problems in men.

Purpose of the Study:

• To synthesize existing research on the relationship between social isolation, loneliness, and substance use, including alcohol, gambling, and gaming.
• To explore how these associations differ across demographics and in specific contexts like the COVID-19 pandemic.

Main Methods:

• Review of animal and human studies, including population surveys, cohort studies, and pandemic-specific research.
• Analysis of behavioral data related to alcohol consumption, gambling, and gaming in relation to loneliness and stress.

Main Results:

• Adolescent male rodents show increased alcohol consumption after isolation; adult rodents show little effect.
• Human studies present varied findings, with some linking loneliness to less frequent drinking and others to alcohol problems in men.
• Loneliness can predict increased risk of heavy drinking and is associated with increased alcohol use in those with depression and anxiety.
• Loneliness is linked to increased gaming problems, while stress affects both gambling and gaming.

Conclusions:

• Loneliness and social isolation represent significant public health issues with complex associations with alcohol and behavioral problems.
• The impact of loneliness on substance use varies by sex, age, mental health status, and specific behavior.
• Further research is needed to understand the mechanisms and develop targeted interventions for loneliness-related substance use.