I had my issue with weight gain.
Hence, I did a lot of reseach and self experiment regarding this problem.
After years of discovery...
I had my conclusion.
The only way to lose weight and stay alive and healthy is to work out.
I joined the gym and and work out almost everyday and the rest will be just fine.
Regarding miss ain question about weight.
She said she is 150cm tall and weight 50kg.
Technically that number indicate that she's not fat. Maybe a bit petite. But not thin for sure.
Nevertheless.. According my experience... If u are 150cm tall.. U should be around 50kg in weight to look good. But this rule apply for guys only. So if u are 170cm tall... Ur weight should be around 70kg. And u have a great body. Not much fat.
But for lady... it's different. People are so obsessed seing skinny pretty model. Those people are at least 175cm tall and the weight no more than 50kg. So, it's a bit different. Lady... If u want to look great...u need to work hard. Yes... nothing new here. If u are 150cm tall.. U need to be 40kg weight then u look great. No offence to miss ain here. But to be healthy... U r just fine miss ain :)