Advice to reduce fats

Your problem is very general. The main precaution you have to take is to completely stop junk and out side food as it causes lots of harm. Reducing sugar, fried and spicy food makes a lot of difference.

• You can have a glass of warm water with juice of one lemon first thing in the morning.
• Having teaspoon of apple cider vinegar in glass of water twice before meals is good.
• Drinking green tea is beneficial. Make it a habit to clean the colon every day.
• Do not stop eating completely as it will have an adverse effect on your health.
• Eat small quantity of food at a time. Eat for 4-5 times a day. Do not overload your stomach.
• Have a walk after meal. Do not sleep immediately after a meal.

 
Besides all these precautions if you have no exercise it is of no use. Do regular exercise. For reducing abdomen and thighs swimming and brisk walking is very beneficial. It gives exercise to full body. If swimming is not possible cycling is also good exercise. Doing Yoga is also beneficial. I can suggest some of them –

• Dhanurasan - lie on your stomach. Hold ankles with the help of your hands. Push yourself up. Only your stomach should touch the ground. Your shape should be like an arc. Hold your breath and be in the same position for ½ a minute.
• Suryanamaskar – ( Sun salutation ) is very beneficial.

With the help of these exercises you will definitely reduce your abdomen and thighs.

For Suryanamaskar you can refer to the link –
http://www.yogawiz.com/yoga-poses/yoga-asanas/sun-salutation.html