Hello
Welcome to simple, quick, easy and perfect thesis statements for IELTS 7+. 
So, the first thing we are going to do is say your point of view. 
That's obvious, but let's take a look at a student example. 

The student starts 'at times it is believed that marriage should be done before the age of 30, however'. This is completely Irrelevant to the thesis. The thesis is your point of view.
This is not necessary.
'I completely reject this notion.' This is not necessary either.  
'and believe that there are much more significant factors to be considered than age, thus the following essay shall discuss the same and draw a plausible conclusion.'
So, what's wrong with this? 'more significant factors' just in terms of ideas you need to say what those factors are. 
The following essay will discuss the same? what, the same thing you didn't tell me about. 
So, you have too many words and no clear point.
Let's take a look at another.

It's a bit better. 
'While there are some benefits to getting a job straight after school, I would argue that it is better to go to college or university.'
So, it is a clear argument. 
You want to say your point of view. That's good.
So, what's wrong with it?
We'll get to that in part 2. 

This is a simpler way. This essay will argue that fast food is bad. 
Very clear.
The last one was a complex sentence. 
The point is 'what is your point of view?' That's what the examiner wants to know.
We know, very clearly. I don't have to read many words. 
Got it.
the examiner goes 'I know your argument.
as quickly as possible, tell the examiner what you pov is.
again, don't say 'extremely or strongly' it doesn't matter.

OK, second thing you need to do.
you need to give two reasons
so, a student example here....
The examiner goes 'what reasons are you talking about'?
Then the feeling isn't  'i get you' it's 'what are you talking about?'
That is the number one problem an examiner has. 

So, here we have the simple thesis. 
Because, now we are going to tell you the two reasons.
so, why do we have the two reasons?
you are going to use those two reasons as your paragraphs.
so there you have in your thesis, the structure of the whole essay.
 Paragraph 1 is about ingredients and paragraph 2 is about the environment. 
Why because,, this reason and this reason.

if you write this in your thesis, you already know what this essay is going to be about. 
The examiner knows what your point of view is.
task achievement is fully answering the question and fully explaining these.
the examiner reads and already knows what you are going to say.
It's called good clear communication. 
If we go back,,,,,, jump back to the very first one,
I see this a lot
I completely reject,,,,,,,,,,
You see the difference? what factors? Conclusion to what? 
What conclusion are you going to draw from nothing?

If you can lay out the structure in your thesis, you know what the whole essay is going to be and you can write it out nice and clear. If you practice doing that you'll get good at it really quickly.
So here's the structure again.
Here it is, subject, verb, object....
So, we have point of view and the reasons, why we believe this should be banned, and the reasons: harmful and can be used against civilians.
here's the structure.....

The other thing this thesis is doing for you is giving you a full structure that you can follow. it's easy to practice, and your grammar mark, you have a compound sentence. 
You have SVO before because and you are using correct grammar. 
Compound-complex sentence, clear point of view, you know what your essay is going to be about. You have the best chance of getting a high mark.
where do i get this from? This responds to the band descriptors.
The course walks you through every bit of the essay so that you can get a high mark.