Women with a BMI of less than 18.5 are considered underweight. The average woman's height is 5 feet, 4 inches. If you weigh 107 pounds or less at this height, you are considered underweight with a BMI of 18.4. A healthy weight range for that woman would be 108 to 145 pounds.
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.
The National Heart, Lung, and Blood Institute indicates that a healthy weight for a woman who is 5 feet, 4 inches tall ranges from 110 to 140 pounds with a BMI of 19 to 24. A woman whose BMI score is above 25 falls in the overweight category and 30 and above falls in the obesity category.
BMI ranges
below 18.5 – you're in the underweight range. between 18.5 and 24.9 – you're in the healthy weight range. between 25 and 29.9 – you're in the overweight range. 30 or over – you're in the obese range.
A weight under 100–110 pounds (50kg)
The average American woman 20 years old and up weighs 170.6 pounds and stands at 63.7 inches (almost 5 feet, 4 inches) tall. And the average waist circumference? It's 38.6 inches.
Weighing too little can contribute to a weakened immune system, fragile bones and feeling tired. You can check if you're underweight by using our BMI healthy weight calculator, which shows your body mass index (BMI). If your BMI is below 18.5, this suggests that your weight may be too low.
What should your waist measurement be? For men, a waist circumference below 94cm (37in) is 'low risk', 94–102cm (37-40in) is 'high risk' and more than 102cm (40in) is 'very high'. For women, below 80cm (31.5in) is low risk, 80–88cm (31.5-34.6in) is high risk and more than 88cm (34.6in) is very high.
What exactly counts as being "skinny?" Some healthcare experts believe a BMI in the 15-18 range to be clinically underweight. This seems to fall pretty close to what many everyday people consider to be "skinny" with a BMI of 18 or lower frequently listed as the indicator of someone considered to be slim.
Women with a BMI of less than 18.5 are considered underweight. The average woman's height is 5 feet, 4 inches. If you weigh 107 pounds or less at this height, you are considered underweight with a BMI of 18.4. A healthy weight range for that woman would be 108 to 145 pounds.
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.
A person with a BMI of 18.5–24.9 will be within the healthy range. According to guidelines, a person with a BMI of less than 18.5 is underweight and may need to gain weight for their health. However, in some cases, it is possible for an individual to have a low BMI but remain healthy.
First, what is skinny fat? “Skinny fat” simply describes a state in which someone has too little muscle mass and too much body fat. People who are skinny fat often look normal or even skinny when wearing clothes, but look soft, weak, and flabby underneath. Hence the name, “skinny fat.”
Many people use low body weight to excuse unhealthy eating and physical inactivity. But body weight is not the best indicator of internal well-being. A much better indicator is your diet. When it comes to your health, it's what's on the inside that counts and you really are what you eat.
The role of employers and local government was to ensure there was a minimum of 65% participation, with a goal to decrease Japan's obesity rates by 25% by 2015 and failure to meet these goals results in a fine. However, this has erroneously been taken to mean that the 'metabo' law makes obesity illegal.
People who are underweight typically are not getting enough calories to fuel their bodies. Often, they are also suffering from malnutrition. Malnutrition means you are not taking in enough vitamins and minerals from your food.
For example, while a medium-framed, 5-foot-tall woman should weigh about 100 pounds, a small-framed woman of the same height should ideally weigh about 90 pounds and a large-framed 5-foot-tall woman should weigh about 110 pounds, based on the University of Washington guidelines.
“Obesity incidence starts increasing in one's twenties and peaks at 40 to 59, and then decreases slightly after age 60,” says Craig Primack, MD, an obesity medicine physician at the Scottsdale Weight Loss Center in Arizona.
Changes in total body weight vary for men and women. 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.