I was a ''naturally skinny'' child at   111  school. Ate whatever I wanted, was very well fed, had a strong appetite, was a quite athletic kid, did a load of extracurricular sports activities as well as school sports. I can't remember but I'm almost certain I had an 'underweight' bmi category. Funnily enough,   7124  all the people I remember giving me hell about it were other chubbier kids at school, fat relatives and fat strangers...I had a paediatrician I was taken too regularly, never remember him saying anything much about it...this was in the 90's.