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BMI Formula:
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Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. For seniors over 70, the healthy range is adjusted to 23-29 kg/m², recognizing that slightly higher weight may be beneficial in older age.
The calculator uses the standard BMI formula:
Where:
Explanation: The formula divides weight by the square of height to estimate body fat. For seniors, the interpretation differs from standard adult ranges.
Details: For individuals over 70, BMI between 23-29 kg/m² is associated with lowest mortality risk. This higher range accounts for age-related changes in body composition and the protective benefits of slightly higher weight against frailty.
Tips: Enter weight in kilograms and height in meters. For height in centimeters, divide by 100 (e.g., 175 cm = 1.75 m). All values must be valid (weight > 0, height > 0).
Q1: Why is the BMI range different for seniors?
A: Research shows slightly higher BMI (23-29) is optimal for seniors, as very low BMI increases frailty risk while the dangers of overweight are less pronounced in older age.
Q2: How accurate is BMI for seniors?
A: BMI remains useful but has limitations as muscle mass decreases and fat distribution changes with age. Waist circumference may provide additional information.
Q3: Should seniors try to lose weight?
A: Weight loss should be carefully considered and supervised for seniors, focusing on maintaining muscle mass through protein intake and exercise.
Q4: What if my BMI is below 23?
A: Consult a healthcare provider. Unintentional weight loss in seniors requires evaluation for underlying conditions and may indicate malnutrition risk.
Q5: Are there better measures than BMI for seniors?
A: Comprehensive assessment including muscle mass, strength, physical function, and nutritional status provides the best picture of health in older adults.