I'm writing a longer sub stack article but the gist of it is in the ai summary below:

The Opening Puzzle

- Diagnosed with Hashimoto's; on T4-only medication (levothyroxine), high dose (250mcg)

- Felt progressively "dumber" over time — but with intermittent windows of sharp creativity, fluent vocabulary, easy word-finding, like my younger self

- Standard labs "normal" (TSH ~2), antibodies improved (down from >1000 to 130) — so on paper, treated and fine

- Key anomaly: temporarily coming *off* medication sometimes made me feel *better* cognitively, not worse

The Initial Hypothesis

- Suspected the brain wasn't getting enough active thyroid hormone despite normal blood levels

- Core insight: TSH reflects what the *pituitary* sees, not what brain tissue experiences

- The brain runs almost entirely on T3 (active hormone), converted locally from T4 by the D2 enzyme

- If that conversion is impaired, the brain can be hypothyroid while bloodwork looks normal

Why the Dose Was a Red Flag

- 250mcg is a very high T4 requirement (standard is ~1.6mcg/kg)

- Ruled out absorption causes: negative H. pylori, no celiac (already gluten-free), tried empty-stomach dosing, good vitamin D/B12/ferritin, negative parietal cell antibodies + normal gastrin

- High dose + normal TSH + persistent symptoms suggested the problem wasn't substrate (T4) but conversion to active hormone

The Mechanisms Investigated

- Reverse T3 (rT3): high T4 gets shunted into inactive rT3, which occupies T3 receptors without activating them — a competitive antagonist

- DIO2 polymorphism: genetic variant impairing brain-specific T4→T3 conversion; silent in healthy people (they have backup T3 sources), but exposed in T4-only patients with a damaged gland who've lost those backups

- Tissue-specific hypothyroidism: liver/kidney (D1 enzyme) convert fine; brain (D2 enzyme) doesn't — different organs, different thyroid states from the same blood

The Genetic Evidence

- Pulled 2015 raw genetic data (from 23andme)

- **DIO2 rs225014: CT (heterozygous)** — confirmed one copy of the conversion-impairing variant

- **MTHFR A1298C +/+ (homozygous):** parallel issue — impairs BH4 production, the rate-limiting cofactor for dopamine/serotonin/norepinephrine synthesis

- **Slow MAO-A:** catecholamines clear slowly — relevant to both symptoms and later anxiety

- Two independent mechanisms converging on the same neurotransmitter systems that govern word-finding, creativity, emotional range

Mapping Symptoms to Brain Regions

- Hippocampus (highest D2 density): word-finding, memory retrieval

- Default Mode Network: divergent/creative associative thinking — the "younger self" mode

- Prefrontal cortex: working memory, task-switching (compounded by low dopamine)

- Cerebellum: verbal fluency, sentence construction

- Striatum: motivation, reward, libido, anhedonia

- All functionally under-resourced, not structurally damaged — reversible

Why Alcohol, LSD, Nicotine, Caffeine Were Diagnostic Clues

- Alcohol/LSD briefly restored "feeling normal" — because they bypass the synthesis bottleneck via direct receptor activation and DMN disruption

- Couldn't feel nicotine/caffeine before the fix — dopaminergic system too depleted to respond

- Effortless nicotine start/stop before treatment — low dopamine meant no reinforcement, so no addiction grip

- These weren't random; they were a functional readout of a depleted monoamine system

The Intervention (Phase 1)

- Added 5mcg T3 (liothyronine) directly — bypasses the broken conversion step

- Reduced T4 from 250 → 200mcg — cuts substrate feeding rT3

- Chose synthetic combo over NDT for precise, independent titration (and to avoid the T3-heavy NDT ratio, risky given slow MAO-A)

- 6-week lab cadence; tracked resting HR, HRV, sleep, symptoms

What Changed (Weeks 1-3)

- Week 2: dramatically better word-finding, sentence structure, analogies; more emotion-centered

- Libido normalized

- Started *feeling* nicotine and caffeine (dopamine system coming online)

- Deeper sleep, vivid dreams returning (REM recovery)

- Faster toenail growth (peripheral metabolic marker — hard to fake)

- Girlfriend independently noticed: more attentive, more "silly," more myself (external validation, no placebo bias)

- HRV rose from high-30s to low-50s and held

- Transient anxiety (slow MAO-A adaptation as catecholamines came up) — resolved on its own

- Improvements settled from peak to a sustainable plateau — not a reversal, and distinct from prior T4-reduction crashes because the mechanism was actually addressed this time

The Confirming Labs (Week 6)

- TSH 3.80 (up from 2.0 — proof the T4 cut outweighed the T3 add; not over-replaced)

- Free T4 1.7 (top of range — abundant substrate)

- Free T3 3.0 (only mid-range — poor output despite abundant substrate)

- Reverse T3 24 (top of range — substrate being shunted to inactive hormone)

- FT3:rT3 ratio 1.25 (target >2.0 — quantified conversion failure)

- SHBG 65 (high despite TRT lowering it — liver is thyroid-replete while brain isn't: the regional dissociation made visible)

- hsCRP <0.2, cortisol 12.0 — ruled out inflammation and HPA dysfunction as confounders

- Every number told one consistent story: impaired conversion + reverse T3 dominance + tissue-specific hypothyroidism

The Takeaways

- "Normal TSH" does not mean optimized — it reflects pituitary status, not brain tissue

- A poor FT3:rT3 ratio can hide behind normal standard labs

- Genetics (DIO2, MTHFR) explain why identical treatment fails some people and works for others

- Direct T3 isn't a workaround for the root cause — for impaired conversion, it *is* the mechanistically correct fix

- The cognitive/emotional "self" that seemed lost was never gone — it was an under-fueled system, and the fuel was the missing active hormone

- n=1, self-directed, but every layer (symptoms, genetics, substances, labs, external observation, objective markers) independently pointed the same direction

Phase 2 (in progress)

- T4 → 150mcg, T3 → 10mcg split BID

- Targets: FT3 upper-third, rT3 mid-teens, ratio >2, SHBG trending, TSH with headroom

- Plus methylation support (5-MTHF, methyl/adenosyl B12, R5P) for the parallel BH4 pathway

I hope this helps people

There's been a lot of sarcastic, low effort posts and comments lately. As a reminder this is not a sub to promote other religions or shit on Islam. It's a place for academic critique. I will no longer give warnings and instead just give out 7 day bans.

This includes passive aggressive comments. I don't care how you feel about Islam or any other religion. If you can't be objective there are other subs you can post on.

I miss a lot of things because this sub has grown a lot since I started it, please continue reporting

Some background: I was raised Sunni Muslim and lost trust in the tradition over time. The variant issue (different schools, contradictions, etc.) wasn't really the core problem. The deeper issue is that I no longer trust the tradition that was supposed to give me access to truth, and now I'm trying to figure out what to replace it with. Why do I NEED to replace it with anything? Well, I suppose that's a more personal question, but I, like other humans, would like to restore a sense of meaning to life beyond the typical selfish indulgences.

A friend pushed me on this recently and pointed out that I don't actually have a clear basis for determining whether any existential or religious claim is true. I've been running on gut feeling and a desire to be part of something that builds a better society. Those are motivations, not truth-tracking mechanisms.

Do I simply reject all claims that are unfalsifiable or is that too dissmissive?

My working framework:

Truth claims seem to fall into roughly four categories, each with different rules:

1. Empirical claims (age of the universe, whether prayer reduces stress), evaluated by observation, experiment, falsifiability
2. Logical/mathematical claims, evaluated by deductive proof from axioms
3. Metaphysical claims (does God exist, is consciousness fundamental), can't be reached by pure empiricism. Requires inference to the best explanation, coherence, explanatory power
4. Moral/value claims, moral intuitions tested against reason, consistency, lived consequences

I think a lot of religious arguments fail because they treat metaphysical claims like empirical ones, or vice versa.

My evaluation process for any claim:

• What category is it in?
• What would the world look like if it were false? (If I can't answer this, the claim might be unfalsifiable, which doesn't automatically mean false, but means I need different tools.)
• What's the strongest version of the opposing view? Can I steelman it?
• Am I believing this because it's true, or because I want it to be true / fear it being false?
• What's my confidence level, and what would shift it?

One thing that helped: separating "is there something transcendent/divine?" from "is this specific tradition correct about it?" These are two different questions and I was conflating them. You can be confident on the first and agnostic on the second.

Where I'm stuck:

• Most religious traditions are unfalsifiable, which makes them slippery to evaluate. Every outcome can be retrofitted into the tradition. How do you evaluate something that can't be falsified without dismissing it entirely?
• I'm aware that "it makes sense to me" is the actual stopping point for most belief, but that feels disturbingly close to confirmation bias.

My questions for the community:

1. What's your actual framework for deciding what's true, especially for stuff that can't be tested?
2. How do you handle unfalsifiable claims without either credulously accepting them or reflexively dismissing them?
3. Did you arrive at your current beliefs through a process you'd call rigorous, or was it something else (intuition, experience, community, etc.)? And do you trust that process?
4. Any books / thinkers / traditions that genuinely helped you build your epistemic toolkit?

Not looking for converts in any direction looking for honest accounts of how thoughtful people navigate this.

Example of claims in Islam that are unfalsifiable:

• Allah answers every dua, but in one of three ways: gives you what you asked, gives you something better, or stores it for the akhirah
• The existence and activity of jinn, angels, and shayatin
• The inimitability of the Qur'an

Yes I used AI to clean this up