High blood sugar occurs when your body can’t effectively transport sugar from blood into cells. When left unchecked, this can lead to diabetes. One study from 2012 reported that 12–14% of US adults had type 2 diabetes, while 37–38% were classified as pre-diabetic (1). This means that 50% of all US adults have diabetes or pre-diabetes. Here are 15 easy ways to lower blood sugar levels naturally.