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Short daily fasting is usually fine for many adults during a menstrual bleed, but heavy flow, dizziness, anemia, or chronic illness are clear stop signs.

Yes, short fasts can be OK while nursing an older baby, but long or no-water fasts may cut milk supply and strain you, so ask your doctor first.

Yes, plain water is usually allowed before fasting blood work, but stick to unflavored water only and follow the exact fasting time your clinician gave.

Yes, most fasting styles still allow plain water, but strict religious fasts and some medical prep rules ban any drink at all, even water.

Yes, you can drink plain water while fasting for blood work, unless your doctor gave different directions for a specific test.

Yes, plain water (no flavor, sugar, or cream) is usually allowed before a fasting blood draw, unless your clinician gave stricter prep instructions.

Yes, fasting in the days right after menstrual bleeding ends is usually fine for many healthy adults, as long as energy, hydration, and iron levels feel stable.

Yes, limited time-restricted fasting can be allowed after gastric bypass, but only once healing is stable (often 6–12 months out) and your bariatric team

Yes, fasting after sleeve gastrectomy can be allowed later in recovery, but long fasts too soon can harm healing, hydration, and nutrition.