I guess everyone is built differently. I’m 34, 5 foot 7 and I’ve never weighed more than 60Kg. I have a very fast metabolism (I can have a meal and be starving within 2 hours) and I’m a type one diabetic. If I’m not in perfect control of my blood glucose for a bit, I start losing weight like crazy.

Im now weight 53Kg and struggling to gain any measure of weight.