Before you start writing essays that are extremely worded, you should first make sure that you are responding to the prompt in the proper manner. Outline the discussion first, then address the direct question being asked:  
  
*Topic: Researchers show that overeating is as harmful as smoking.  
Discussion: advertising for food products should be banned in the same way as the cigarette advertising is banned in many countries  
Direct Question: To what extent do you agree or disagree.*  
  
The above outline is what you should have done so that you could have properly outlined your response, making sure that no prompt instructions were changed and that you properly formatted your response. So, let's look at what your discussion outline looks like when compared to the original:  
  
Topic: many adopt a view that overeating is a detrimental problem which increases morbidity and mortality like smoking does, (CORRECT)  
Discussion: the governments should accordingly take proactive actions (PARTLY CORRECT, MISSING REFERENCE TO SMOKING ADVERTISING)  
Response: In my opinion, although imposing bans on food commercials would be effective to some what extent, it is over-simplistic to say that such approach could address the problem. (WRONG !)  
  
*Correct Response: Recent data analysis indicates that over indulgence when it comes to food has the same detrimental effects as consuming cigarettes. That is why there should be a move to prohibit food promotions in a manner similar to the nicotine promotions prevention being done in the other nations. I fully disagree with this statement based on commonly known reasons.*  
  
Breakdown:  
  
*Topic: Recent data analysis indicates that over indulgence when it comes to food has the same detrimental effects as consuming cigarettes. (CORRECT: )  
Discussion: That is why there should be a move to prohibit food promotions in a manner similar to the nicotine promotions prevention being done in the other nations (CORRECT)  
  
Response: I fully disagree with this statement based on commonly known reasons. (CORRECT !!!)*  
  
The correct response to the question would have been a single opinion dis/agreement with the given topic and discussion points. You changed the prompt discussion requirement, creating a deviation which shows that your response is unrelated to the task. Writing almost 400 words is useless because the essay will have automatically failed anyway. All because you improperly responded to the essay question which is the basis of the 2 reasoning paragraph discussion.  
  
You approached this essay as a research paper. Another error on your part. The response should be based only on your personal knowledge or information using examples from your own experience or public observations. This was meant to be a 290 word essay composed of 4 paragraphs. This is not a Task 2 essay, this is an academic research paper. This is a direct singular opinion discussion essay. The format and the discussion approach is incorrect and will result in your failing score.  
  
Again, writing a long essay is not going to assure you of a high passing score if you did not respond to the discussion requirements as indicated by the original prompt. It is senseless to show off your English vocabulary when your English comprehension skills, as per understanding what the discussion requirement is, remains faulty. You will always fail the task test if you do not understand what the question is and how to respond to it. I have shown you evidence of this problem above.