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c/glp1muscle·posted 12 days ago by u/step_count_stan

[Data] BIA vs DEXA on the same day, 6% apart, pick a method and stay with it

Data Well Actually ×9

Posting this because I searched for it and got nothing useful.

Setup: 12.5mg, week 42, sulphur burps present but not ruining anything. I changed exactly one variable — sarcopenia — and tracked it for 22 weeks.

Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am putting it here rather than presenting it as a finding. If two or three other people have done the same thing we might actually learn something.

Not medical advice, obviously. This is one person with a spreadsheet.

440 up / 74 down86% upvoted28 commentsid 4qd7de17 Jul 2026

28 comments

20 in this archive, depth 6

best — the order this archive was captured in

u/rina_nascimento42 points·12 days ago

Mechanistically the bit that matters is DEXA. It explains most of the early profile and a decent chunk of the outcome.

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u/step_count_stanOP33 points·12 days ago

Mechanistically the bit that matters is DEXA.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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u/ferran_dahlberg10 points·12 days ago

FFMI tracking requires body composition

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u/step_count_stanOP18 points·12 days ago

Mechanistically the bit that matters is DEXA.

Yes, exactly this, and it is the bit that took me 76 weeks to accept.

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[removed]13 points·11 days ago

[removed by moderator]

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u/tidy_vialdrawer_watch4 points·11 days ago

This is correct. DEXA is the standard.

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u/sunday_shot_sal11 points·11 days ago

Not convinced. The evidence does not support that reading.

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u/erez_yilmaz9 points·11 days ago

Yeah, protein matters on rapid loss.

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u/saskia_wojcik25 points·11 days ago

protein sarcopenia, not "lots"

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u/sanne_novak30 points·12 days ago

protein sarcopenia, not "lots"

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u/long_post_larry9 points·12 days ago

protein sarcopenia, not "lots"

Adding to this: DEXA is doing more work than the comment implies.

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u/greta_lokken3 points·12 days ago

no supplement selling, no coaching solicitation

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u/step_count_stanOP4 points·12 days ago

Week 3 for me and the honest summary is: 31kg down, reflux manageable, and I have thought about food maybe four times today.

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u/throwaway_wl20265 points·12 days ago

protein targets in g/kg

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u/viktor_girard3 points·12 days ago

Yeah, protein matters on rapid loss.

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u/prior_auth_painappeals1 point·11 days ago·edited

sarcopenia is the unsolved question

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u/joaquin_trevino1 point·11 days ago

This is correct. DEXA is the standard.

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u/tomas_lundgren1 point·11 days ago

DEXA is the real measurement

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u/aksel_kjaer2 points·12 days ago

Respectfully this is a sample of one presented as a finding.

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About c/glp1muscle

Lean-mass retention during rapid weight loss: protein targets, resistance-training minimums, DEXA and BIA measurement reality, FFMI tracking, and the sarcopenia question that nobody funded a proper trial for.

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c/glp1muscle rules
  1. Body-composition claims need a method. Bathroom BIA scales are not a method.
  2. Protein targets in g/kg, not "lots".
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