Definition

1. Noun:
   • A measure of body fat based on height and weight: The Body Mass Index (BMI) is a numerical value calculated from a person's weight and height. It is a simple, widely used screening tool to categorize individuals into weight status categories such as underweight, normal weight, overweight, and obese.

Usage

• BMI is primarily used as a population-level screening tool for weight categories that may lead to health problems. It is not a diagnostic tool for individual body fatness or health.
• It is calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²). An alternative formula uses pounds and inches.
• Standard categories are:
  • Underweight: BMI less than 18.5
  • Normal weight: BMI 18.5 to 24.9
  • Overweight: BMI 25 to 29.9
  • Obese: BMI 30 or greater

Examples

• Noun:
  • The doctor calculated my body mass index during my annual check-up.
  • A high body mass index can be an indicator of high body fatness.
  • Public health campaigns often use body mass index to discuss obesity trends.

Advanced Usage

• "BMI": This is the standard and most common abbreviation for "body mass index."
  • Her BMI falls within the healthy range.
• "BMI calculation/formula": Refers to the specific mathematical process for determining the index.
  • The BMI calculation is straightforward but does not account for muscle mass.
• "BMI category/classification": Refers to the weight status group (e.g., normal, obese) assigned based on the BMI number.
  • According to the standard BMI classification, he is considered overweight.

Variants and Related Words

• BMI (n): The standard acronym for Body Mass Index.
• Body fat percentage (n): A different, more direct measurement of body composition, often contrasted with BMI.
• Quetelet index (n): A historical name for the body mass index, named after its inventor, Adolphe Quetelet.

Synonyms

• BMI: The direct acronym.
• Weight-for-height index: A descriptive synonym.

Notes on Usage

• While useful for population studies, body mass index has limitations for individuals. It does not distinguish between weight from muscle and weight from fat, so it may misclassify very muscular athletes as "overweight" or "obese."
• It is one of several tools used to assess health risks associated with weight. Other factors, such as diet, physical activity, and waist circumference, are also important.

Noun

1. a measure of someone's weight in relation to height; to calculate one's BMI, multiply one's weight in pounds and divide that by the square of one's height in inches; overweight is a BMI greater than 25; obese is a BMI greater than 30