I'm a 25 year old female, and ever since I was born I had underweight. My whole family is thin so it is genetic, and my diet is how it should be. My issue is that I have a very thin face that I never really liked. I was wondering how much body fat they need to fill my cheeks so I have a fuller face? My height is 171 cm and my weight is 48 kg. Thank you so much for leaving an answer.