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Gained 1.5kg overnight on tirzepatide

6 replies5 peopleAug 12, 2026☆ Follow
Summary

Why does the scale jump up suddenly on tirzepatide even with very low calories and no constipation?

Users report daily weight swings of several pounds from water retention and other factors. Weighing less often and tracking only lows helps avoid frustration, while hydration is repeatedly suggested. The original poster later notes her cycle is due soon and has been irregular since starting the medication.

What this discussion establishes

Nothing here is advice.

6 replies · 5 people
QuietThistle78archiveopening postAug 12

In my seventh week on tirzepatide, third at the 5mg dose, things were going smoothly until recently. My scale showed 83.3 on Monday, then 84.7 Tuesday, and 84.1 today. This has me really frustrated since I understand it's likely water retention rather than fat, given my calorie intake stays low at 1000-1300. No bowel problems, and water consumption is steady at two liters or higher. It's annoying to feel close to 82 only to see 84 again. Has this happened to others? Maybe I should just wait and see.

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NorthWillow72archiveAug 12
↳ replying to @QuietThistle78 (opening post)

Weighing once a week worked better for me. Lots of things can affect the scale, so don't let it bother you too much. As long as overall progress happens, even if checked monthly, just continue.

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BrightCompass57archiveAug 12

Actually, drinking extra water seems helpful above all else. The number on my scale can shift by three or four pounds over just a few hours. Experts recommend against checking weight every single day, although I continue doing so anyway haha. I maintain notes tracking solely the smallest values observed like 278.80 on June 16, 277.6 on June 21, 276.6 on June 23, 275.6 on June 26, 275.9 on July 6, 275.5 on July 12, 275.2 on July 15, 273.6 on July 16, 273.3 on July 17, 272.5 on July 18, 271.7 on July 19, 270.6 on July 21, 269.6 on July 25, 268.7 on July 26, 268.5 on July 28, 267.5 on July 29, 267.0 on July 30, 265.9 on July 31, 265.7 on August 1, 265.2 on August 2, 264.9 on August 4, 263.6 on August 5, 262.8 on August 6, 262.2 on August 7, 262.1 on August 9, 260.7 on August 10. It was amusing to see 260.7 appear twice during one day plus 264.2 too haha.

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QuietThistle78archiveAug 12
↳ replying to @NorthWillow72

This really gets to me a lot. I attempted limiting to Wednesdays and Saturdays but the need for control is strong. I'll check again only on Saturday to see the result. Thanks!

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SteadyQuill58archiveAug 12

Watching the number rise feels terrible, even knowing it's not fat gain. Stay hydrated and avoid worrying over it.

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PatientKettle48archiveAug 12

Male or female? Sudden water retention can affect anyone, though women often see it around their cycle. No need to reply, just think about it if relevant.

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QuietThistle78archiveAug 12
↳ replying to @PatientKettle48

I'm female. My period is due in about five days, assuming it arrives on schedule, though tirzepatide has been shifting its timing.

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