I get very lightheaded on it. Doc says there’s no substitute. I’m wondering if I low blood sugar? Just got a meter & will start testing tomorrow. I have mild high blood pressure. I am at my wits end to try to feel good after surgery. It’s been since 1984! Grant it, I never kept to a diet at first. Now it’s the most important thing in my life! I had Ceasar salad last night, wrong decision! I used to be a vegetarian! Potatoes are the few veggies can eat.