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ForumsLab Results & BiomarkersCortisol and GLP-1 — HPA axis during caloric deficit

Cortisol and GLP-1 — HPA axis during caloric deficit

Dr.ReproEndo Sun, May 17, 2026 at 2:46 AM 16 replies 540 viewsPage 1 of 4
Dr.ReproEndo
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May 17, 2026 at 2:46 AM#1

Read the primary source rather than the write-up and the two do not agree, so here is what is actually in it.

Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect. Less adipose tissue means less aromatase activity, so in men testosterone commonly rises and estradiol falls, and SHBG rises as insulin resistance improves — which means total testosterone can rise while free testosterone moves less than expected. In PCOS, improved insulin sensitivity frequently restores ovulation, which is a fertility change people are not always expecting.

Where I think it is weakest: the follow-up is short relative to how long people actually take these drugs, so durability is an assumption here rather than a finding.

What I actually want to know is why total and free can move differently here, and which of the two is worth tracking. Tell me what I have not thought of.

Note on sourcing:
Figures above are from the primary publication rather than the press summary. If a number here disagrees with one you have, post yours and we will work out which of us is reading a secondary source.
29 7mona_PHX, andrew_nyc, Dr.EndoEP and 26 others
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InsuranceTom
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May 17, 2026 at 3:01 AM#2
Dr.ReproEndo said:
Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect.

HPA axis assessment on the hormone panel: rarely ordered but informative for understanding the stress-metabolism connection:

4-point salivary cortisol:

  • Morning: 16 ng/mL → 14 ng/mL (improved)
  • Noon: 9 ng/mL → 5 ng/mL
  • Evening: 4 ng/mL → 2 ng/mL
  • Night: 2 ng/mL → 1 ng/mL

The cortisol curve is normalizing — less flat, better diurnal variation. Reduced visceral fat = reduced cortisol overproduction. The metabolic benefits cascade into stress hormone regulation.

Last edited: May 17, 2026 at 8:01 AM
30 8lucas_SP_BR, lisa_labSD, adam_van and 27 others
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VendorMark
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May 17, 2026 at 3:16 AM#3
Dr.ReproEndo said:
Most of the hormonal change here is a consequence of adiposity falling rather than a drug effect.

Sex hormone labs after weight loss on the hormone panel — for the men in this thread:

Testosterone: 340 → 580 ng/dL (dramatic improvement!)
Free T: 5.5 → 12.0 ng/dL
Estradiol: 42 → 26 pg/mL
SHBG: 22 → 38 nmol/L

Visceral fat contains aromatase which converts testosterone to estrogen. As you lose visceral fat, this conversion decreases and testosterone naturally rises. I feel 10 years younger.

31 9MarkLI_maint, Dr.PeteFamMed, claudia_zurich and 28 others
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BariatricNurseD
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May 17, 2026 at 3:31 AM#4
VendorMark said:
Sex hormone labs after weight loss on the hormone panel — for the men in this thread: Testosterone: 340 → 580 ng/dL (dramatic improvement!) Free T:…

Hormone panel changes on the hormone panel — relevant for anyone curious about endocrine effects:

  • Testosterone: increased 35% (weight loss reduces aromatase in adipose tissue)
  • Estradiol: normalized from elevated baseline
  • SHBG: increased appropriately
  • Free testosterone: increased 22%
  • Cortisol AM: within normal limits, no significant change

My reproductive endocrinologist says the testosterone improvement alone could explain the energy and mood benefits I've experienced.

32 10tom_AK, josh_phd_bmore, roxy_nash and 29 others
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roxy_nash
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May 17, 2026 at 4:52 AM#5
InsuranceTom said:
HPA axis assessment on the hormone panel: rarely ordered but informative for understanding the stress-metabolism connection: 4-point salivary…

This is my experience too, for whatever a second data point is worth. Posting only so the count is not one.

33 11kim_atl_prep, sarah_TO, wendy_avl and 30 others
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