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

Amino acid analysis for peptide identity — looking for input

tom_AK Thu, May 16, 2024 at 5:30 PM 15 replies 2,058 viewsPage 1 of 3
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tom_AK
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Jan 2026
Anchorage, AK
May 16, 2024 at 5:30 PM#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 narrow version of the question is how people are hitting a protein target on a genuinely suppressed appetite, because volume is the binding constraint rather than willingness.

Happy to be told the question itself is wrong.

26 21steve_okc, dave_SLC, FDA_TrackerJim and 23 others
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PharmD_Rodriguez
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Jan 2024
Miami, FL
May 16, 2024 at 5:35 PM#2

This one has a reasonably settled answer, so here it is. 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.

25 20TinaHashiRN, robert_kc, dan_philly and 22 others
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NauseaFreeNow
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Indiana
May 16, 2024 at 5:40 PM#3
PharmD_Rodriguez said:
On a suppressed appetite the winning strategy is protein density per unit of volume, not per calorie.

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.

24 19Dr.PulmRoch, maya_sedona, stefan_berlin and 21 others
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KristenIndy
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May 2024
Indianapolis, IN
May 16, 2024 at 5:45 PM#4
tom_AK 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. The RDA is the wrong reference and it is worth understanding why. 0.8 g/kg is the intake at which nitrogen balance is not negative in healthy weight-stable adults — a floor for deficiency prevention, not an optimum, and derived in a population that is not in a deficit. In a substantial energy deficit, protein requirement rises because amino acids are being oxidised for energy and because muscle protein synthesis is blunted. The literature on preserving lean mass during weight loss lands around 1.4 to 2.0 g/kg of reference body weight, which is roughly two to two and a half times the RDA.

Last edited: May 16, 2024 at 10:45 PM
23 18DataDave, Dr.GutHealth, amsterdam_pete and 20 others
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sarah_TO
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Toronto, CA
May 16, 2024 at 6:12 PM#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 mass273 lbs218 lbs220 lbs
Fat mass123 lbs73 lbs55 lbs
Lean mass161 lbs148 lbs157 lbs
Body fat %42%34%24%

Lean mass preserved — actually GAINED 1-2 lbs thanks to progressive overload + 1.5g/kg protein. The protein intake discussion needs to include body comp data, not just scale weight.

22 17DanielChem_CHI, marco_milano, pam_columbus and 19 others
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