Add lot of fibers ( salads, vegetables,fruits,Ispaghula)& lot of water,liquids ( soups,juices,lime water, curds,milk ) to diet.
Avoid eating sweets, fast/junk food.
drink a big tumbler of luke warm water mixed with 1 spoon honey & 10 drops of lemon juice.
Start regular daily exsercises( brisk walk, physical exsercises abdominal exsercises .yoga
Use mild laxative ( Cremaffine) at bed time.
This will gradually improve your bowel movements & reduce weight too.