Diabetic. I let my blood sugar get wildly out of control. Daily sugar in the 300s, A1C 13 something.
Consulted doc and medical nutritionist. Nutritionist suggested daily carbs in the 100s (I forget exactly). I asked if sub 100 would be safe, she said yes.
So for three months i took in 40 to 100g/day. Cut A1C to low 7.something, daily sugar down to high 80s to low 100s. Side effect: lost 30 pounds.
Cut out all junk food, all bread, all "added sugar." Ate more meat and dairy. Read every label or searched online.
KEY was a food/carb diary. Recorded everything I ate and its carb content, totaled carbs every day. Recorded sugar multiple times/day. Recorded blood pressure occasionally. Not much exercise. Started recording weight once a week when I noticed my clothes were loose.
So:
* Decide what actions you'll take.
* Record those actions as appropriate.
* Record progress as appropriate. For example, daily weight may be counter productive.
* Adjust as necessary.