From Healthline:
"If you have high cholesterol, consider adding beet juice to your diet.
A 2011 study on rats found that beetroot extract lowered total cholesterol and triglycerides and increased HDL, or “good,” cholesterol. It also reduced oxidative stress on the liver.
Researchers believe beetroot’s cholesterol-lowering potential is likely due to its phytonutrients, such as flavonoids."

Beets are also great for lowering blood pressure.