This is such an underappreciated fact. Lots of people think 20kgs overweight is normal, they'll call you skinny and tell you to eat more if you're a healthy weight. An adult man of average height should probably not weigh more than 80kg. It could be okay if you're very muscular but most likely you'd be better off losing a few kilos. And being extremely muscular to the point where your BMI says overweight isn't exactly good for your health either. Though probably better than just being fat.