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ForumsTirzepatide (Mounjaro / Zepbound)Tirzepatide body composition: SURMOUNT-1 DEXA substudy data Page 2

Tirzepatide body composition: SURMOUNT-1 DEXA substudy data

MikeFit_NJ Wed, Jun 3, 2026 at 6:53 AM 12 replies 270 viewsPage 2 of 3
Dr.PeteFamMed
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Jun 4, 2026 at 10:25 AM#6

Adding the numbers, since they settle part of this. Practical numbers: half-life about 5 days, steady state 3 to 4 weeks, ladder 2.5 / 5 / 7.5 / 10 / 12.5 / 15mg, and the maintenance doses with published data behind them are 5, 10 and 15mg.

Happy to go further on any of that.

Last edited: Jun 4, 2026 at 11:25 AM
31 1hyun_seoul, jim_asheville, matt_MKE and 28 others
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TinaHashiRN
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Jun 4, 2026 at 9:24 PM#7

A narrower follow-up, since the general answer is now clear:

What fraction of loss being lean mass is actually normal, because the numbers quoted here range from 10% to 40% and cannot all be right?

30 0mike_mod, SarahChen_PharmD, sarah.morrison and 27 others
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sean_dublin
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Jun 5, 2026 at 8:24 AM#8
Dr.PeteFamMed said:
Practical numbers: half-life about 5 days, steady state 3 to 4 weeks, ladder 2.5 / 5 / 7.5 / 10 / 12.5 / 15mg, and the maintenance doses with…

There is a second half to this that has not been said yet. Steady state is faster than people expect: half-life about five days, so you are at plateau in roughly three to four weeks rather than five. That matters when you are deciding whether a dose step has finished expressing itself.

29 24gary_naperville, sean_dublin, hannah_MT and 26 others
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MikeFit_NJ
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Jun 5, 2026 at 7:24 PM#9

Reporting back.

Second scan under matched conditions, six months apart, same time of day: the lean number came back nearly a kilo higher than the panic scan. Strength was up throughout.

Last edited: Jun 5, 2026 at 10:24 PM
28 23SandraNC_45, Dr.EndoIndy, tom_AK and 25 others
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lisa_labSD
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Jun 8, 2026 at 12:07 AM#10
sean_dublin said:
Steady state is faster than people expect: half-life about five days, so you are at plateau in roughly three to four weeks rather than five.

Agreed on the ranges, with the condition that a single DEXA is not a measurement, it is one draw from a distribution. Hydration status moves the lean compartment by a kilogram or more between scans, so any comparison of scans done at different times of day or different hydration states is noise.

Last edited: Jun 8, 2026 at 3:07 AM
38 13cory_ATX, lori_vegas, Dr.PulmRoch and 35 others
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