Body weight, health, and longevity.

Area of Science:

• Public Health
• Epidemiology
• Biostatistics

Background:

• Current US population weights often exceed those associated with maximum longevity.
• Overweight individuals, particularly younger ones, face higher mortality risks.
• The impact of excess weight on mortality may be delayed and influenced by confounding factors.

Purpose of the Study:

• To analyze the relationship between body weight and longevity in the US population.
• To highlight the need for precise definitions and appropriate confounder analysis in weight-related health studies.

Main Methods:

• Review of existing studies on body weight, morbidity, and mortality.
• Emphasis on careful interpretation considering definitions, pre-existing conditions, follow-up duration, and confounders.

Main Results:

• Weights associated with greatest longevity are typically below the average population weight.
• Overweight status, especially starting at younger ages, is linked to premature death.
• Cigarette smoking is identified as a significant potential confounder.

Conclusions:

• Studies on weight and mortality require meticulous attention to methodology and definitions.
• There is a need for a comprehensive database to establish desirable weight ranges based on morbidity and mortality data.