Quick English to Japanese Help
 

The increase of eating here is a problem.
something like that

What is the context?

it's just a sakubun about how eating too much fast food causes obesity. My sensei wants me to edit my sentence because it's a little unclear, so I need to say the increase of eating at Mcdonalds is a problem.

What's your sentence? Always "show your work" here to get good help.

ファストフードは日本の問題だと思う

That says "Fast food is Japan's problem." That's different than what you are trying to say.

My sensei said that my sentence is too vague. But I'm also mentioning the trend of eating at fast food places like McDonalds, so she doesn't want me to just say that fast food is bad.

So, where is your own attempt to say in Japanese what you need to say?

マクドナルドで食べることの増えたことは問題だと思う 。but it doesnt sound right somehow

You are getting closer. This means "I think the fact that more people are eating at McDonald's is a problem."