What are some natural ways to reduce plaque build up in arteries?

Not much: Hi. There's not much "natural" you can do to help reduce atherosclerotic plaque except healthy diet and regular exercise, and obviously don't smoke. The biggest issue, your genetics, is not a modifiable variable. You're young, but there are bad genes that can cause atherosclerotic events in your age group. If you can give us more information, perhaps we can be of greater assistance. Good luck!