I hear this phrase a lot but I have no idea what it stands for or how do certain foods increase inflammation, like sugar for example. Google isnt really helpful I cant make a solid conclusion out of the information on there.
There was a post asking the same thing a couple days ago, and there are plenty of answers to your question there: https://www.reddit.com/r/nutrition/comments/t6s4rc/what_is_inflammation_why_is_it_consistently_used/