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When is a BMI considered underweight?

Body Mass Index (BMI) is a widely used measurement to assess an individual’s weight status in relation to their height. It is calculated by dividing a person’s weight in kilograms by the square of their height in meters. While BMI is not a direct measure of body fat, it is commonly used as an indicator of whether a person is underweight, normal weight, overweight, or obese.

Definition of Underweight BMI

When it comes to BMI, being underweight refers to having a BMI value below the normal range. The World Health Organization (WHO) classifies BMI categories as follows:

• Underweight: BMI less than 18.5
• Normal weight: BMI between 18.5 and 24.9
• Overweight: BMI between 25 and 29.9
• Obese: BMI 30 or higher

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Therefore, if an individual’s BMI falls below 18.5, they are considered underweight. However, it is important to note that BMI is just one factor in determining a person’s overall health. Other factors such as muscle mass, body composition, and individual variations should also be taken into consideration.

Health Implications of Being Underweight

Being underweight can have various health implications and may indicate an inadequate intake of nutrients or an underlying medical condition. Some potential health risks associated with being underweight include:

• Compromised immune function
• Increased risk of infections
• Delayed wound healing
• Decreased muscle strength and endurance
• Reduced bone density and increased risk of osteoporosis
• Hormonal imbalances
• Fertility issues
• Impaired cognitive function
• Increased susceptibility to fatigue and weakness

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If you have concerns about being underweight, it is advisable to consult with a healthcare professional who can assess your overall health, conduct further evaluations if necessary, and provide appropriate guidance and support.

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