My fasting blood glucose on testing was higher than my post food glucose. Is it abnormal? Fasting for blood work typically involves avoiding food and drink (except water) for eight to twelve hours to ensure accurate results, particularly for tests like glucose, cholesterol, and triglycerides. It is important Is Glutathione Good for Liver Health? Exploring Its Benefits, Uses, and Side Effects IVDrips How Does Fasting Affect Glutathione Levels in The Body