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ForumsCOA & Analytical TestingAmino acid analysis for peptide identity — looking for input

Amino acid analysis for peptide identity — looking for input

rick_sfbay Tue, Mar 10, 2026 at 7:06 AM 14 replies 787 viewsPage 1 of 3
rick_sfbay
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Mar 10, 2026 at 7:06 AM#1

My appetite is suppressed enough that hitting a protein target is now the hardest part of the day, and everything I read assumes I can simply eat more.

The arithmetic that makes it tractable: reference weight in kg times 1.6 gives the target; divide by four for a per-sitting figure; then find four foods that hit that figure in a volume you can actually finish. Most people need two of the four to be liquid or semi-liquid early on.

What I am trying to establish is whether the RDA is the wrong reference entirely during rapid weight loss, and what the actual target should be.

Numbers rather than impressions, if you have them.

15 10mike_mealprep, NicoleRaleigh, james_edin and 12 others
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sarah.morrison
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Mar 10, 2026 at 7:22 AM#2

Short answer first, then the reasoning. Distribution matters less than total but it is not nothing. Roughly 25 to 40g per sitting with enough leucine to trigger synthesis, three or four times a day, is more effective than the same total in one enormous evening meal — and on a suppressed appetite the enormous evening meal is the one you will not finish anyway.

Correct me if the detail matters more than I have assumed.

Last edited: Mar 10, 2026 at 8:22 AM
14 9roxy_nash, tony_orlando, Dr.NephBHM_UK and 11 others
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ZaraB_AL
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Mar 10, 2026 at 7:38 AM#3
sarah.morrison said:
Distribution matters less than total but it is not nothing.

Agreed on the target, with the caveat that reference weight and current weight are different numbers. Using current weight at the start of a large loss produces a target that is both unachievable and unnecessary.

13 8TirzTom, TrialTracker_MD, JennaRN and 10 others
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pam_stl
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Mar 10, 2026 at 7:54 AM#4
rick_sfbay said:
My appetite is suppressed enough that hitting a protein target is now the hardest part of the day, and everything I read assumes I can simply eat…

This matches mine closely enough to be worth saying so. On a suppressed appetite the winning strategy is protein density per unit of volume, not per calorie. Isolate powders, Greek yoghurt and cottage cheese, egg whites, lean fish, and tinned tuna all deliver a lot of protein in a small physical volume. Front-load it: appetite is usually least suppressed in the first hours after waking and worst on the day or two after dosing, so get the majority in early in the day and early in the week.

12 7SleepDoc_PDX, RegAffairsDC, BiostatsBrad and 9 others
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hyun_seoul
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Seoul, KR
Mar 10, 2026 at 9:17 AM#5

From the other side of the consultation, briefly.

DEXA scan update relevant to protein intake:

Scanned at months 0, 6, and 12. Here are the body comp numbers:

BaselineMonth 6Month 12
Total mass281 lbs236 lbs218 lbs
Fat mass121 lbs81 lbs53 lbs
Lean mass159 lbs152 lbs155 lbs
Body fat %42%32%22%

Lean mass preserved — actually GAINED 1-2 lbs thanks to progressive overload + 1.6g/kg protein. The protein intake discussion needs to include body comp data, not just scale weight.

11 6LipidDoc_ATL, BariatricNurseD, MASHdoc_SA and 8 others
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