Everything has two sides, and diet is not an exception.
... the word "diet" is too general and has a broader meaning. This is my suggestion for this line;
Everything has two sides and maintaining a shapely figure by controlling one's diet is not an exception. .... here it sounds more specific :)
It's a good introduction.
Obesity affects badly the bones and the muscles and causes difficulty in movement. It is also very harmful on a man's heart as the more fat you have, the more load this will be on your heart. Good moderate diet helps fat people lose the excess weight and get rid of obesity forever. Practicing more exercise and eating healthy food helps in burning unwanted fat; as a result a person can lose weight and do more effort.
.... This is all true, but where is the response to your topic? You need to have more emphasis on how dieting would make a person's life better. Remember to give reasons for your opinion on the argument in your body paras. After giving the reason, you need to back it up with an example.
