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How much is it normal for my period to be late if I've been fasting for 3 weeks (I've lost 2 kg in 3 weeks, eating around 1000 calories/day)?

It is normal for menstrual periods to be delayed or absent during prolonged fasting. Starting to eat normally again should help the menstrual cycle return to normal over time. Stress can also contribute to menstrual irregularities. It is difficult to predict exactly when periods will return after fasting, so it is important to listen to your body and give it time to adjust.