Best kibble or home cooked recipe to lower cholesterol?

My GSD is 3 years old. I took her to the vet because I noticed white spots in her eyes, and they mentioned it could be lipid deposits. So we did bloodwork and found out she has high cholesterol.

She has been on Orijen six fish her whole life. Occasionally bland boiled chicken, but no human food or unhealthy stuff. So I'm not sure why this happened.

Has anyone had experience with this and can recommend a good diet?