A number of things, are you researching for some kind of weightloss business?

Firstly, people with a waist line of over 80cm have been found to have a much higher risk of various diseases, including kidneys, liver and some cancers.

Secondly, excess body weight puts strain on the heart, joints and muscles.

Thirdly, depression is commonly related to overweight people because of body image issues, but moreso because exercise releases endorphins, a hormone that stimulates good feelings.

That being said, avoid fad diets, maniac exercise and so on. Your best bet is simply to find forms of exercise you enjoy, start slowly, and to explore a variety of options for your diet. My experience in this is somewhat unusual because I have an extremely slow metabolism, so I really only eat about half of what the average person should and I suffer no ill effects for it. Even with exercise I gain weight if I eat anymore than that. Most people should NOT do that without the advice of a doctor.

Getting your BMI done, plus a general checkup from your doctor is also a good idea and it'll give you a good indication of your overall health, and your weight is only an outward sign of that.

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