Hello, I just wanna know whether there is change in your lifestyle in last 3-4 month, if not then firstly I would suggest to under go thyroid test because sudden weight gain could be because of hypothyroidism.
consult a Dietician for the customised diet chart.
For effective weight loss try to choose from healthy foods groups like whole grains, fruits, vegetables and sprouts.
Avoid maida products and refined products also avoid junk foods and fried foods.
Do regularly exercise for Atleast 30-45 mins