Yes, I believe knowing your blood sugar levels is more important than knowing your ketone levels. Once you’re in ketosis and you know how it feels, it’s all about managing blood sugar.  That’s because if you’re metabolically healthy and your blood glucose is low, your insulin is low as well. If your insulin is low, your ketone levels are high and vice versa. As a result, if you keep your glucose levels low, you don’t have to worry much about ketone levels.