Outcomes · Body composition

About the Body composition category

Outcomes › Body composition DXA bioimpedance lean mass loss

Pinned Wiki

owen.bradyTL4 Moderator27 Dec 2024#1

Community wiki post. Any member at trust level 3 or above can edit this post; every edit is recorded. Last edited by hana.sato on 28 Jul 2025.

28 Jan 2025 — owen.brady: Replaced an unsourced figure with the published one and cited it.
22 Jan 2025 — mira.patel: Removed a claim that the cited source did not support.
28 Jul 2025 — hana.sato: Clarified the distinction that was causing repeat questions below.

Editors: owen.brady, mira.patel, hana.sato

Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

DXA, BIA, ultrasound and the precision of each. Lean mass preservation during rapid loss.

This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with its author and a note. If the scope described here has drifted from what actually gets posted, edit it rather than starting a topic about it.

What belongs here

Questions specific to body composition, with the units and the context stated.
Reports and datasets, with the collection method stated.
Disagreement about the substance, conducted in public.

What belongs elsewhere

Anything urgent belongs in Safety, immediately, and not here.
Anything about how this site works belongs in Meta.
Requests for a maintained page belong in Wiki requests.

Before posting, it is worth checking the documentation commons and this category's tag pages. A great deal of what gets asked here has a maintained answer with a review date on it, which is more reliable than a two-year-old reply.

0 likes 19mo

owen.bradyTL4 Moderator3 Feb 2025#2

Staff post. Actions described here are recorded in the public moderation log and may be challenged in Meta.

Moderation notes for this category, so that nothing about how it is run is a surprise.

Topics get moved into and out of here regularly. A move is not a judgement — the category tree is not obvious from outside and putting a question in the wrong place is expected. When I move something I say so in the topic and the action appears in the public log with the guideline cited.

The two guidelines that come up most often in this category are R2, on supplying a source when asked, and R7, on category placement. Neither is used punitively.

19 likes 18mo

c.ostergaardTL2 Moderator1 Mar 2025#3

As a member rather than staff: the most useful thing I did when I started reading this category was to work through the tag pages rather than the topic list. The topic list shows you what is recent. The tags show you what is settled.

5 likes 17mo

ppm_errorTL3Analytical chemist25 Mar 2025#4

Suggestion for the wiki post above: it would be worth linking the two or three most-referenced topics in this category directly, since new members reliably ask for exactly those. Happy to make the edit myself if nobody objects, with a revision note.

0 likes 16mo

ni.kravchenkoTL2 Moderator16 Apr 2025 · edited#5

Lean mass loss during rapid weight reduction: depends on protein intake, resistance training volume, and total energy deficit. Adequate protein and maintaining training intensity both help preserve lean mass.

0 likes 15mo

isotonic_sheetTL3Regular7 May 2025#6

Precision versus accuracy: the precision you need depends on what question you are answering. "Am I losing fat?" requires less precision than "Is my lean mass preservation within the expected range?"

26 likes 15mo

Suggested topics

Topic	Participants	Replies	Views	Activity
DXA precision and the least significant change for lean mass — the long version Outcomes › Body composition bioimpedance lean mass loss data table On the subject in the title: DXA precision and the least significant change for lean mass — the long version Working notes rather than a conclusion. Maintenance rather than loss, which is the part of this…	+97	111	22k	14mo
Ultrasound and skinfolds: operator dependence in practice — what changed since Outcomes › Body composition data table DXA bioimpedance lean mass loss Posting this under the heading it deserves: Ultrasound and skinfolds: operator dependence in practice — what changed since Everything below is what sits behind that. Longitudinal report with the method…	+32	37	7.4k	3mo
Two scans six weeks apart on different machines: a cautionary tale Outcomes › Body composition lean mass loss data table bioimpedance DXA Solved On the subject in the title: Two scans six weeks apart on different machines: a cautionary tale Working notes rather than a conclusion. Longitudinal report with the method stated, because a number without a…	+18	26	9.4k	2mo
Second pass at: Circumference measurements as a poor man's composition estimate Outcomes › Body composition DXA lean mass loss data table Second pass at: Circumference measurements as a poor man's composition estimate — setting out what I have, and where I think it stops being reliable. Longitudinal report with the method stated, because a…	+64	68	13k	4mo
Second pass at: Two scans six weeks apart on different machines: a cautionary tale Outcomes › Body composition DXA bioimpedance lean mass loss data table Second pass at: Two scans six weeks apart on different machines: a cautionary tale Writing it up because I had to work it out twice and would rather nobody else did. Maintenance rather than loss, which is the…	+1	5	34k	8mo

Related topics — sharing the tags DXA, bioimpedance, lean mass loss

Topic	Participants	Replies	Views	Activity
About the Protein & intake category Nutrition & Training › Protein & intake lean mass loss micronutrients constipation Pinned Wiki Meeting protein targets on a suppressed appetite, fibre, and eating enough of anything at all. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with…	+4	8	9.7k	22mo
Programming during a large energy deficit Nutrition & Training › Resistance training lean mass loss fatigue DXA Programming during a large energy deficit — setting out what I have, and where I think it stops being reliable. Maintenance rather than loss, which is the part of this that almost nobody writes about. I have…	+39	49	36k	2d
DXA precision and the least significant change for lean mass — the long version Outcomes › Body composition bioimpedance lean mass loss data table On the subject in the title: DXA precision and the least significant change for lean mass — the long version Working notes rather than a conclusion. Maintenance rather than loss, which is the part of this…	+97	111	22k	14mo
Follow-up: Interpreting a composition change that is within the error bars Outcomes › Body composition DXA lean mass loss bioimpedance data table Solved Interpreting a composition change that is within the error bars Writing it up because I had to work it out twice and would rather nobody else did. Longitudinal report with the method stated, because a number…		2	95	24d
A 40-week log with the measurement method stated — what changed since Outcomes › Progress reports effect size data table DXA long read Solved A 40-week log with the measurement method stated — what changed since Writing it up because I had to work it out twice and would rather nobody else did. Longitudinal report with the method stated, because a…	+9	13	2.1k	9h

Sponsored Janoshik Analytical — independent third-party testingHPLC purity and mass-spectrometric identity on submitted samples, reported with the method stated. The laboratory most often cited in this community’s verification records.Independent testing → Sponsored GL Biochem (Shanghai) Ltd. — synthesis, directFounded 1998. ISO 9001 and cGMP certified, over 1,500 staff and 200-plus patents. Custom peptide synthesis and amino acid derivatives, with a batch certificate on every order.Custom synthesis →