1. Reason
1.1. Let's begin by looking at the first / [main] reason of ...
1.2. One of the main reasons of/that [...] is that [...] instead of [...].
1.3. Another cause of [smth] is that [...]. In other words ...
2. A good example of this [is ...] / [would be ....].
2.1. Example
2.1.1. Take [sbd/smth] as an example
2.1.2. It can be best examplified by ... (noun)
3. There is no doubt / [It is undeniable] that [...] has become an essential part of our life. However ...
4. Explanations
4.1. It is common these days for [smb] to [do smth], rather than [do smth else].
4.2. What I mean by this is that [...]. / That is to say, [...].
5. [These days] Nowadays, it is becoming more and more / [increasingly] popular/ [common]... to [do smth].
6. Introduction
6.1. 1. General thought about the subject (theme rephrazed)
6.1.1. Over the last few years, it has become increasingly popular to [do smth].
6.1.2. Over the last decades/years [smth] has become an increasingly debatable issue.
6.1.3. One of the widely discussed issues nowadays is [...].
6.2. 2. Support of the 1st sentence
6.2.1. These days, [governments] are very aware, that the issue of [obesity] needs to be tackled urgently.
6.2.2. In my country, the problem is becoming worse and worse, and it is important to take steps to make [teaching] more [attractive].
6.2.3. There is no doubt that...
6.2.4. For many people, especially ...
6.3. 3. Identify the task and tell the reader your plan
6.3.1. This problem has clear / [certain] reasons and in this essay will look at the main causes of the problem and propose some solutions.
7. Conclusion
7.1. 1 sentence conclusion
7.1.1. To sum up / All things considered / In conclusion, there is no doubt that [obesity] is an increasingly worrying issue, affecting both [children and adults].
7.1.2. To sum up, [...] is a serious problem, and unless we [do smth], [smth/smb] will start to suffer.
7.2. Summary main points (diff. vocabular)
7.2.1. In my view / [As I see it] the main responsibility for solving the problem lies with [...], [...] and [...].
7.2.2. There is a serious problem, which could lead to [...].
7.2.3. As I see it, [governments, parents and schools] all have a role to play in tackling the problem.
7.3. Finishing touch / Personal opinion
7.3.1. Actions must be taken urgently, otherwise our [society] will face even greater [health] problem in the future.
7.3.2. [Governments] must take steps to deal with the problem as soon as possible.
8. Body
8.1. Solutions
8.1.1. The solution is for [smb] to do [...].
8.1.2. To address this issue, [smb] could [do smth]. / To tackle this problem, [smb] should ...
8.1.3. Dealing with this issue involves [...ing].
8.1.4. Finally, [smth] is the third important factor of ...