Brief Answer:
Detailed information given below.

Detailed Answer:
HI Dipti,
Thanks for your query. I have read it&understood your concern.
A) Increase in weight can be due to
1)life style problems
-Eating habits-over eating or bringe eating. Eating fast food,Excess of sweets,fried things,
2) lack of exercise-
-Sedentary work.,excessive sleeping, no regular exercises
3)some medical conditions- like thyroid problem,Diabetes,polycystic ovarian disease, excessive cholesterol in blood.
B)When somebody thinks of reducing weight..one has to take care from all these three angles .So I would suggest you to-
C)
1)Start eating a balanced diet with
-Restricted carbohydrates..less of sugar,rice,wheat,potatoes,sweet fruits, sweets,oily or spicy food,fried food etc.
- Eat - more of proteins(pulses,sprouts,soya products,nonspicy nonveg food)/ vegetables ,salads,non sweet fruits/minimum of Roti&rice/drink butter milk,
2)form a habit of 45 minutes exercise daily regularly (games,swimming, gardening dancing ,running,jogging,brisk walking,)
Yoga exercises&Pranayama for 20 minutes daily.
3) Sleep for 6 hours sound sleep daily. (Use yoga Nidia for that) in night .No or minimal sleep in day time.
-Avoid excess of psychological stress.
5)Get yourself checked for the medical conditions mentioned above to exclude or find any of the problem followed by specific treatment .
Consult your family doctor for that.
6)You can join health clubs /Jim..to get expert advises & guidance under one roof
But,a positive mind set &determination with continued efforts would give you required weight loss in 3-4 months time with your own efforts .Best of luck!!
I hope the answer helps you .Any follow up query is welcome.
Thanks.

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