Outcomes · Body composition

About the Body composition category

Outcomes › Body composition DXA bioimpedance lean mass loss

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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.ostergaardTL21 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.kravchenkoTL216 Apr 2025 · edited#5

Circumference measurements at marked sites, taken consistently, track composition change better than most people expect for the cost.

The disagreement above is smaller than it looks once the terms are fixed.

0 likes 15mo

isotonic_sheetTL3Regular7 May 2025#6

Maintenance phase: tracking body composition during maintenance (weight stable) is different from tracking during active loss. Changes are smaller and precision becomes more important.

26 likes 15mo

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