Water (1 Cup (8 Fl Oz))

Plain water does not normally raise blood glucose; repeat the check after washing and fully drying your hands, using a new strip, and following your meter or sensor instructions.

If you use a continuous glucose monitor, confirm an unexpected rise with a finger-stick measurement when possible, since sensor readings can lag or vary.

Check whether the drink was truly plain water: flavored waters, electrolyte mixes, hydration powders, syrups, and some medications dissolved in water may contain carbohydrate.

Record the timing of water intake, meals, exercise, stress, sleep, illness, and glucose readings for several days to identify whether another factor is responsible.

Avoid restricting water to control glucose; stay normally hydrated unless a clinician has given you fluid limits.

Contact your diabetes clinician promptly if repeated unexplained elevations occur, or seek urgent care for very high readings accompanied by vomiting, abdominal pain, confusion, rapid breathing, or dehydration.