Sentence 1 - paraphrase the statement (you can use ‘nowadays/today/these days’ to start):
Nowadays the number of overweight people is constantly growing.
Sentence 2 - say what you’ll write about in your essay:
This essay will discuss the main reasons of this epidemic and then describe the possible effects of the problem.
Body paragraph 1 - causes
Sentence 1 - state all the main causes of obesity:
In my opinion, the foremost causes of obesity are inactive lifestyle and unhealthy eating habits.
Sentences 2-3 - describe the first cause. Assume that your examiner has no knowledge in this area and you have to explain all the details to him.
Today more and more people rely on cars instead of walking, have less physical demands at work and prefer inactive leisure activities. This results in burning less calories and gaining weight.
Sentences 4-5 - describe the second cause. Don’t forget that it’s useful to give examples while describing causes!
Moreover, the problem is accentuated by the growing number of people, who eat irregularly and consume large portions of high-calorie food. For example, about 50% of the adult population in Europe with so-called disordered eating suffer from obesity.
The possible effects of this problem include physical health problems and loss of productivity.
Sentences 2-3 - explain the first effect and give an example:
First of all, obesity results in incorrect functioning of the human body and contributes to the risk of developing some chronic illnesses. For example, as body fat percentage increases, the person’s metabolism worsens, which in turn may result in diabetes or heart diseases.