There can be many reason of not putting weight even though you are eating properly , due to some cause people won't gain weight means like
DiabetesThyroid
VitaminD
PCOD
Vitamins level
Ibs
Etc
Before Prescribing any thing , we need proper information like
1. Cause of disease
2. How it is affecting your body's other paramet er
3. What are your vitals
4. Current health status and many more,
According ly we plan diet to treat the cause and deficiency , so that you can put on weight easily.