Please! A Reader Is Not Proud Her Thinness

She sent me this message… I expect from you some suggestions those can help her.
 
"Hello Naomi and PChoco’s Friends. I got a problem and I need your advices about it. I am a lady and I am 27 years old and I am thin. My weight is still less than 45 kg and it makes me to be ashamed. I tried everything in order to weigh a bit more but it didn't work. Do you know something I should take to achieve my goal? I don't want to be thick but just perfect"