170cm male 80 kilograms, calculated body mass index is 27.7kg/m2, belongs to overweight abnormal, need to reduce weight. 170cm male, according to the standard weight (ideal weight) formula, male standard weight is equal to 50 plus 0.9 times the height minus 150, calculated 170cm male standard weight should be about 68 kilograms; the actual weight can be added or subtracted within 10% of the standard weight is normal. Therefore, for a 170cm male, the normal weight range is 61.2~74.8 kilograms. The male is overweight, need to appropriate weight loss, overweight, obesity can increase the risk of early death, but also associated with a variety of chronic diseases, including diabetes, stroke, coronary artery disease, hypertension, respiratory and other diseases, so it is recommended that the patient a reasonable diet, appropriate exercise, weight reduction, can consult a professional dietitian guidance.