@feruze-- Pomegranate juice can cause a blood sugar spike in some people. You should try a half glass and then test your blood sugar one or two hours later to make sure it doesn't cause too much of an increase. If you eat the whole fruit, you will get less carbs and less sugar.
If both pomegranate and pomegranate juice has a bad effect on your blood sugar, you can take pomegranate supplements instead. Make sure they don't have sugar.
I personally think that for a diabetic with high cholesterol and normal blood sugar levels, pomegranate has more benefits than risks.