Hello,
It would had been great if you would had provided your weight & height as well which would had helped us to understand your case in much better way.
The weight gain is pretty obvious here due to sedentary lifestyle. Here eating habit also plays vital role because what goes in mouth shows result in our body.
Next Steps
I would suggest you to consult dietician for the same. Find out how many kgs your are over weight & start losing weight soon before its too late.
Health Tips
A healthy lifestyle modification is really important.