What You Will Learn
Discover the basics of body weight—all based on expert health information from the National Library of Medicine.
Get answers to common questions asked about body weight.
- How do you know if your current weight is healthy?
- What is body weight?
- What are the definitions of underweight, normal, overweight, and obese?
- What are the 5 main causes for sudden weight loss?
- What are the 4 main causes for sudden weight gain?
- What are the 2 main healthy ways to lose weight?
- What are the 2 main healthy ways to gain weight?
Body Weight Explained From the Experts Video
This video brought to you by The NASH Facts™ project—an organization committed to bringing you expert information from trusted sources related to fatty liver disease and NASH.
How Do You Know If Your Current Weight Is Healthy?
Your healthy body weight depends on your sex and height. For children, it also depends on your age.
What Is Body Weight?
Body weight is defined as the weight of your body. As a measured number, it includes the weights of:
- Muscle mass
- Body fat
What Are the Definitions of Underweight, Normal, Overweight, and Obese?
“Underweight”, “normal”, “overweight”, and “obese” are all labels for ranges of weight.
Obese and overweight mean that your weight is greater than it should be for your health.
Underweight means that it is lower than it should be for your health.
Normal, or healthy weight, depends on your sex and height.
What Are the 5 Main Causes for Sudden Weight Loss?
A sudden, unexpected change in weight can be a sign of a medical problem. Causes for sudden weight loss can include
- Thyroid problems
- Infectious diseases
- Digestive diseases
- Certain medicines
What Are the 4 Main Causes for Sudden Weight Gain?
Sudden weight gain can be due to:
- Thyroid problems
- Heart failure
- Kidney disease
What Are the 2 Main Healthy Ways to Lose Weight?
The 2 main healthy ways that can help in losing weight are:
- Good nutrition
What Are the 2 Main Healthy Ways to Gain Weight?
The 2 main healthy ways that can help to add weight are:
- Eating extra calories within a well-balanced diet
- Treating any underlying medical problems
The NASH Facts™ Project would like to thank MedlinePlus from the National Library of Medicine and the NIH: National Heart, Lung, and Blood Institute.
MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.
The primary NIH organization for research on Body Weight is the National Heart, Lung, and Blood Institute.
What You Should Remember
- Healthy body weight depends on your sex and height
- A sudden, unexpected change in weight can be a sign of a medical problem
- Good nutrition and exercise can help in losing weight