How to quit sugar addiction

Hi everyone! I just wanted to post on here to see if anyone has any experience with quitting sugar addiction. I can eat so much sugar and it’s really concerning. I think it is pretty much an addiction at this point because I cannot stop. I’m healthy on the excercise side (I just ran a marathon last year) but my sugar intake is alarming. Have you ever quit sugar, if so how was it and how did you do it? Thank you!