See if you're a healthy weight for your height by checking your BMI. If you're underweight, your doctor can check for any health conditions that may have caused you to lose weight, such as: <ul> <li>an overactive thyroid gland <a href="/thyroid-disease/thyroid-over-active">(hyperthyroidism)</a></li> <li><a href="/diabetes/diabetes-type1">type 1</a> or <a href="/diabetes/diabetes-type2">type 2 diabetes</a></li> <li><a href="/coeliac-disease">coeliac disease</a>, a condition that prevents your body from absorbing food properly</li> <li>eating disorders, such as <a href="/eating-disorders/anorexia-nervosa">anorexia nervosa</a></li> <li>body dysmorphic disorder</li> </ul> Once the cause of your weight loss has been found, your doctor can give you advice about making changes to your diet, sometimes with the help of a dietician. The type of food you will need to eat to put on weight will depend on what is causing you to be underweight. ::: body-ad-desktop zones:: 232632,232439,232640 types:: 163 disclaimer:: AD typeFilter:: native_ad adCount:: 1 :::

How can I gain weight safely? 



See if you're a healthy weight for your height by checking your BMI.

If you're underweight, your doctor can check for any health conditions that may have caused you to lose weight, such as:

- an overactive thyroid gland [(hyperthyroidism)](/thyroid-disease/thyroid-over-active)
- [type 1](/diabetes/diabetes-type1) or [type 2 diabetes](/diabetes/diabetes-type2)
- [coeliac disease](/coeliac-disease), a condition that prevents your body from absorbing food properly
- eating disorders, such as [anorexia nervosa](/eating-disorders/anorexia-nervosa)
- body dysmorphic disorder

Once the cause of your weight loss has been found, your doctor can give you advice about making changes to your diet, sometimes with the help of a dietician.

The type of food you will need to eat to put on weight will depend on what is causing you to be underweight.

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Article information

Before trying to put on weight, you need to know that it is safe to do so. Learn about how to gain weight safely here - using content verified by certified doctors.