If you are prediabetic -- that is why. Are you taking Metformin? Should you be?
I am too and I know eating something like that without a matching protein is going to SLAM into my blood sugar and send it spiking.
Keep away from brownies and their pals. If you are going to have it, save it for a special time -- birthdays and holidays and go in already eaten a protein and measure your portion out.
Once you get into the blood spike and crash cycle, you want more sugary/starchy things to spike you back up for the high because the crash feels awful -- sleepy, low energy, blaaah, shaky, anxious, etc. It's hard to break back out of.
You might look up the
Insulin Resistance diet even though you are doing Weight Watchers just to learn how to match the protein to carbs so your blood sugar stays stable and not shooting all around.
You have extra obstacles with the prediabetes, but don't beat yourself up over. It is what it is. Just move on toward learning to manage your condition.
GL!
A.