81xa
HTN ➡️ CL 2026
- Joined
- Sep 21, 2023
- Posts
- 667
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- 752
INTRODUCTION
The carnivore/primal space loves posting total testosterone without any sex hormone-binding globulin or free testosterone context, and jfl if you think that's accidental, total T in isolation is essentially a vanity metric, yet these guys have built their entire dietary identity around it while remaining blissfully unaware that SHBG exists.
THE MECHANISM
Insulin suppresses SHBG production. Zero-carb diets produce chronically low insulin, which signals the liver to upregulate SHBG. That SHBG then binds circulating testosterone and renders it biologically inactive, meaning you can have elite total T while free testosterone sits in a genuinely mediocre range. It's a predictable physiological consequence of sustained carbohydrate restriction, and it shows up consistently in the blood work of anyone who actually bothers to include SHBG on their panel.
EXAMPLE
Frank Tufano is the clearest documented example, he has total T around 3500, but his SHBG is so elevated that free T is basically makes him borderline hypogonadal jfl
WHAT TO ACTUALLY EAT
You don't need high carb intake to address this. You need enough insulin stimulation to prevent SHBG from climbing, which on training days is about 100–150g from quality sources (honey, fruit, potato, rice). Rest days can sit lower. Animal-based with moderate carb timing is certainly superior to strict carnivore for free testosterone specifically, while retaining all the benefits of an animal food foundation. Total T as a standalone metric is essentially useless. I have yet to see a kid on carnivore with adequate SHBG.
Thoughts?
The carnivore/primal space loves posting total testosterone without any sex hormone-binding globulin or free testosterone context, and jfl if you think that's accidental, total T in isolation is essentially a vanity metric, yet these guys have built their entire dietary identity around it while remaining blissfully unaware that SHBG exists.
THE MECHANISM
Insulin suppresses SHBG production. Zero-carb diets produce chronically low insulin, which signals the liver to upregulate SHBG. That SHBG then binds circulating testosterone and renders it biologically inactive, meaning you can have elite total T while free testosterone sits in a genuinely mediocre range. It's a predictable physiological consequence of sustained carbohydrate restriction, and it shows up consistently in the blood work of anyone who actually bothers to include SHBG on their panel.
EXAMPLE
Frank Tufano is the clearest documented example, he has total T around 3500, but his SHBG is so elevated that free T is basically makes him borderline hypogonadal jfl
WHAT TO ACTUALLY EAT
You don't need high carb intake to address this. You need enough insulin stimulation to prevent SHBG from climbing, which on training days is about 100–150g from quality sources (honey, fruit, potato, rice). Rest days can sit lower. Animal-based with moderate carb timing is certainly superior to strict carnivore for free testosterone specifically, while retaining all the benefits of an animal food foundation. Total T as a standalone metric is essentially useless. I have yet to see a kid on carnivore with adequate SHBG.
Thoughts?
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