Welcome to HealthcareMagic Public Forum
Considering your eating habit your weight do not appear more (50kg) to us.
It is possible in conditions like:
-If you inducing vomitting or purging after eating. (Bulimia nervosa
-High basal metabolic rate
Evaluation by psychiatrist
(Bulimia nervosa) and general physician (for thyroid function) will help you.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal