A BMI below 13.5 can lead to organ failure, while a BMI below 12 can be life-threatening. Note, however, that BMI alone is not enough to make a diagnosis of anorexia and is solely a possible indicator.
In anorexia, death from organ failure or myocardial infarction is fairly common (up to 20 percent of cases end this way) and tends to happen when body weight has fallen to between 60 and 80 pounds (although it can occur at any time).
Set point theory states that the human body tries to maintain its weight within a preferred range. Many people stay within a more or less small range of body weight throughout their adult life. Some people's systems may keep them lean while young but allow them to gain weight after middle age.
under 18.5kg/m2 – you are considered underweight and possibly malnourished. 18.5 to 24.9kg/m2 – you are within a healthy weight range for young and middle-aged adults. 25.0 to 29.9kg/m2 – you are considered overweight.
In males, a BMI of around 13 appears to be fatal. The coefficient of variation (CV) of the BMI is 8.7%. In contrast, females survive to a lower BMI of around 11, although with greater index variability (CV 14%). Several females had BMI's as low as 9 and 10.
Being underweight, a BMI of 18.5 or less, is associated with reduced life expectancy of more than 4 years.
45 (kg) divided by 2.25 (height squared) = 20. This means a person with a height of 150cm and a weight of 45kg would have a BMI score of 20. According to the BMI, that person would be in the “healthy weight range”.
There are also different tiers of anorexia based on BMI ranging from mild (<17.5), moderate (16-16.99), and severe (15-15.99), to extreme (<15). A BMI below 13.5 can lead to organ failure, while a BMI below 12 can be life-threatening.
By weighing 50 kgs you would not fall under the underweight category but a healthy BMI range of (18.9).
Mostly, losing weight is an internal process. You will first lose hard fat that surrounds your organs like liver, kidneys and then you will start to lose soft fat like waistline and thigh fat. The fat loss from around the organs makes you leaner and stronger.
Your slower metabolism will slow your weight loss, even if you eat the same number of calories that helped you lose weight. When the calories you burn equal the calories you eat, you reach a plateau. To lose more weight, you need to either increase your physical activity or decrease the calories you eat.
Men often gain weight until about age 55, and then begin to lose weight later in life. This may be related to a drop in the male sex hormone testosterone. Women usually gain weight until age 65, and then begin to lose weight.
In the hours before death, most people fade as the blood supply to their body declines further. They sleep a lot, their breathing becomes very irregular, and their skin becomes cool to the touch. Those who do not lose consciousness in the days before death usually do so in the hours before.
Dying is a shutting down of the body's physical, sensory, and mental functions, and it happens in stages. This process can take minutes or months, depending on what is going on inside the person's body.
When one major organ begins to shut down, it often leads to other organs shutting down. As organs begin to shut down, most people experience drowsiness and may gradually lose consciousness. Eventually the heart and lungs will stop working and the body dies.
A BMI nearing 15 is usually used as an indicator for starvation and the health risks involved, with a BMI <17.5 being one of the DSM criteria for the diagnosis of anorexia nervosa.
BMI values of less than 18.5 kg/m2 are considered underweight. BMI values between 18.5 kg/m2 to 24.9 kg/m2 are healthy. BMI values between 25 kg/m2 to 30 kg/m2 are overweight. BMI values greater than 40 kg/m2 are considered obese.
Adult Body Mass Index or BMI
To calculate your BMI, see the BMI Calculator. Or determine your BMI by finding your height and weight in this BMI Index Chart. If your BMI is less than 18.5, it falls within the underweight range.
For example, if you are 160cm tall, your ideal weight range is between 51.2 and 64.0 kg, and you are obese if you are above 76.8 kg. There is a similar table with height in feet and inches. You could also use the BMI calculator to determine if you are in the ideal weight category, or these BMI norm tables.
If you are underweight, you may be at greater risk of certain health conditions, including malnutrition, osteoporosis, decreased muscle strength, hypothermia and lowered immunity. You are more likely to die at a younger age. Underweight women have less chance of becoming pregnant than women who are a healthy weight.
The higher your metabolism, the more calories you will burn and the harder it will be to gain weight. Having a fast metabolism is often genetics – if your parents or grandparents were thin, chances are you will be too. This can also mean that you have to eat more calories than the average person to gain weight.
How much kg is skinny? under 18.5kg/m2 – you are considered underweight and possibly malnourished.