It OR they ?

Hi~ I don't understand why "it" is used in this sentence.

Shouldn't it be changed to "they" which I think refer to "sweets and fats" in the previous clause?

What do you think about this? Is "it" correct and what does "it" refer to?

Thanks~

W’s study found that people who are anxious, depressed, stressed, or in pain
are going to be drawn to sweets and fats because it temporarily elevates mood.