Find some strange rules of the university in the world

should ketchup be banned?

In France, Ketchup is illegal in school cafeterias. This is due to French teenagers using so much ketchup in their school lunches. The law was put into place by Christopher Hebert, the president of the national association of municipal catering managers.

I agree with that view of the school. There are two reasons for me to agree.
The first reason, in my opinion, is to protect the traditional values of the dharma. This helps to confirm the role of traditional food. At the same time, it is not to lose the value of traditional food in the hearts of the dharma.

The second reason, limiting Ketchup also contributes to protecting students' health. Because too much sugar in tomatoes can cause diabetes and obesity.
Thanks for listening.

Check your capitalization. Ketchup, not unless you are referring to a specific brand, is not supposed to be capitalized. Titles and names of associations or organizations are to be capitalized, ie. President of the National Association of Municipal Catering Managers.

You can compress your second paragraph to be better. Instead of utilizing two lines, create better flow and structure through saying:
There are two reasons that have made me agree with the school's view.
Is it required to have limited word count? If not, research a little bit more and add supporting details to your reasons. It will help discussing why these traditional values are important. What is the correlation of traditional food values with ketchup? How does ketchup influence the country in this manner?

Moreover, you can quantify what you mean by the health benefits of cutting off sugar. Discuss the quantity of sugar in ketchup. Is it really that bad that the entirety of ketchup has to be made illegal? Remember small facts like the fact that there are multiple types of sugar - and not all these are necessarily bad for someone's health.