Measuring body fat gives a better indication of a healthy weight than weighing scales, so you should always consult your GP if you are concerned about your weight.
The Body Mass Index (BMI) figure, used by many doctors, is your weight in kilograms divided by your height in metres squared. A healthy BMI is in the 18.5-24.9 range. Under 18.5 is considered unhealthy, while overweight is in the 25-29.9 range. Over 30 is considered obese.
Many gyms calculate body fat rather than BMI. Body fat on various parts of the body can be calculated using skin fold callipers, which measures thickness of fat layers, or electronically by passing an electric current through your body using a handheld device.
While the percentage of body fat considered healthy varies depending on issues such as age and sex, the maximum fat for men is considered to be 35 per cent and 40 per cent for women.