[Obesity in old age and its importance for functionality and frailty]

Area of Science:

• Gerontology
• Public Health
• Nutritional Science

Background:

• A high body mass index (BMI) in later life is linked to the lowest age-related mortality rates.
• The World Health Organization's (WHO) overweight classification (BMI 25-30 kg/m²) may be considered normal in old age.
• Obesity is associated with increased disability and functional decline, especially in older populations, and is also linked to frailty.

Purpose of the Study:

• To examine the complex relationship between BMI, obesity, and health outcomes in older adults.
• To provide guidance on the appropriateness and considerations for weight management in the elderly.
• To highlight the risks associated with restrictive diets in older individuals.

Main Methods:

• Review of existing literature on BMI, obesity, mortality, disability, and frailty in aging populations.
• Analysis of the implications of WHO BMI classifications in the context of geriatric health.
• Consideration of individual patient factors beyond BMI for weight management decisions.

Main Results:

• Higher BMI in older age is associated with reduced mortality.
• Obesity increases the risk of disability and functional deterioration in the elderly.
• Weight reduction may be considered for functional reasons if BMI exceeds 30 kg/m², but requires a holistic assessment.

Conclusions:

• Decisions regarding weight loss in older adults must be individualized, considering functional status, body composition, comorbidities, and life perspectives.
• Weight loss interventions in the elderly necessitate strict medical supervision, optimized protein intake, moderate calorie restriction, and physical training.
• Weight reduction is generally not advised for chronically ill elderly patients, and restrictive diets should be approached with caution due to potential for accelerated muscle and bone deterioration.