Joined an unwelcome but not unexpected club this week

Wife is borderline diabetic, she is on Metfomin. She drinks Diet Dr. Pepper like a drunken sailor. She claims it is not bad for her. Is she pulling my leg!????
It's definitely bad. A diet pepsi a day wrecks my control. It doesn't give me a sudden spike rather a long steady rise that takes a bunch of insulin to control. An occasional one doesn't hurt it's the daily intake. But man they're addictive

Metformin was awful. You'll know right away if you're body doesn't like it