
A person becomes fat probably because he or she is taking in much more calories than he or she is consuming for example you take 6000 calories per day by taking 3 meals a day but you are only able to consume 3000-4000 calories a day. The rest are stored in the body as fats and that is where you start gaining those unnecessary kilos.
You have to follow at least one of the two steps to achieve the desired weight loss:
1) Go to the gym
2) Follow a diet
These steps are very important to follow if you want to achieve quick results. Going to the gym is essential for the people who don't compromise on their diet. Taking cue from the above example the 2000 calories that were left unconsumed will be burnt by doing physical workouts. It's completely up to you to carry out these workout sessions at home or at the gym.

water in between or soon after taking meals. This will help your metabolism to increase which will help in timely digestion and consumption of calories. Try to consume green tea and also add fiber to your diet.
The idea is not to put you guys on a diet rather to start eating healthy. So try to surround your self with healthy fruits and vegetables as obviously it's not easy for everyone to control on their appetite for food so whenever you feel the urge to eat something make sure that you surround yourself with food that is healthy and that will help you achieve your desired body weight.