Hi, thanks for using healthcare magic
At your height with your present weight your BMI (
body mass index) is 17.7, which, as you mentioned is a little low.
BMI allows a person to determine if their weight is appropriate for their height. It should be between 18.5 to 24.9.
For your height normal weight range would be 52.2 to 70.3 kg.
To increase your weight your would need to increase the amount of calories you eat and drink and decrease your energy output to prevent
weight loss.
Increasing your calorie intake means: (1)eating more frequently-use high calorie snacks between meals such as nuts
(2)increasing the calorie value of your meals by increasing portion sizes
(3)add agents to your food to help increase the calorie value - peanut butter, butter, dressings, oils
(4)avoid fidgeting and any excess activity
I hope this helps