Fasting requires not eating food or drinking certain beverages for a specified period, typically 8-12 hours, before the test. Preparing for fasting involves understanding the instructions ...

You can consume nothing but water for at least 8 hours before a fasting glucose test. You may also need to follow a low carb diet and avoid exercise for some time before. A fasting glucose test ...

Individuals trying intermittent fasting should check their blood sugars more frequently — ideally, every 2 to 4 hours — especially at first. People with hypoglycemia should break their fast ...