If you’re underweight, it’s not just your energy that may suffer. How do pallid, blotchy skin, thinning hair and brittle nails sound?
You may have wondered for a while if you're underweight. Perhaps friends or your parents have mentioned it.
You can check by using our interactive Healthy weight calculator.
If you're underweight, your GP, practice nurse or school health visitor can give you help and advice.
There could be an underlying medical cause that needs to be checked out.
Or perhaps you haven’t been eating a healthy, balanced diet. That may be due to stress or other emotional problems.
During your teenage years, your body is changing. Sometimes, teenage girls may feel unhappy about these changes, but they are your body’s way of preparing you for pregnancy in later life.
Whatever the situation, if you're concerned about your weight or your diet, the best thing to do is to tell someone. There’s lots that can be done to help.