The test can measure your risk of conditions such as heart disease (Image: Getty)

Many people think that because they are not overweight, they are a picture of health. However, a doctor is warning that just because someone is slim, that doesn't guarantee they are free from health risks.

Dr Philip Bazire , a medical weight loss specialist on the healthcare platform Doctify , says some people of "normal" weight could have something wrong with the way their body deals with nutrients.

He said it could mean they have a "metabolically unhealthy normal weight". There are several symptoms which can show the status of someone's metabolic health.

And he explains that a 30-second test can be a clear indicator of a potential problem. He says this is to measure your waist circumference and

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