Will adding a whey protein shake to your meal containing carbs help keep blood sugar levels in check? Or will the spike be about the same (or worse)?

It will help. There will likely be a small amount of leveling done in respect to your blood sugar. You will likely feel full for longer, though, triggering you to eat less and have less cravings later. If you really want to even out the spike, add fiber to your shake. Cheers!

Related Questions

Can a whey protein shake replace a meal when on a low carb, low calorie, high protein diet?

Maybe. Their are diet plans that substitute high protein shakes for a meal. The carbohydrate content of the shake can vary. Read more...
Whey protein. To some degree, yes, but the protein shake won't give you everything you need. Replacing one meal may be okay, but you still need to consume foods with iron, folate, (folic acid) vitamin a, d, b1-6, etc. I highly recommend protein shakes, but don't neglect the other essentials that your body needs. Read more...