Hi there, thanks for your question.

It sounds like you are concerned about your eyesight and your weight and wonder if these two things are related to your masturbating.

There are lots of myths and tall tales out there about masturbating. One you may have heard of is that too much masturbating will make you go blind. This is not true and it's not based on any kind of evidence. Myths you might have heard about masturbating are simply sayings that people make up, sometimes to discourage other people from masturbating.

Masturbating is a normal and safe thing to do. To the best of our knowledge there are no medical side effects from masturbating, such as poor eyesight or weight loss. It is likely that these health issues are unrelated to your masturbating. If you are still worried though, have a chat with your doctor.

The fact that you are slim is highly unlikely to be related to your masturbating. At 18 you are close to the end of puberty and so your growth spurts and weight gain will slow down. Being slim can happen for a number of reasons, such as lots of exercise, your genes, and having a high metabolism. Again, if you are really concerned you should talk to your doctor.

All the best.