QIF-T0157

medium

Acute tryptophan depletion — serotonin precursor starvation via LAT1 competition

Tier 2 — Validated (Independently Replicated)

Legacy status: CONFIRMED

Technique Details

Tactic: QIF-C.EX
Status: CONFIRMED
Bands: N4, N5, N6, N7

✚ Therapeutic Application

65g large neutral amino acid mixture (excluding tryptophan) floods LAT1 BBB transporter -> tryptophan uptake reduced 80-90% within 5-6hrs -> TPH2 substrate starvation -> central 5-HT synthesis crashes. Effects: impaired reward learning, reduced happy face recognition. Resolves in 24hrs. EPISTEMIC FLAG: direct evidence that ATD reduces extracellular 5-HT is inconsistent (Bell 2001, PMID:21339754). First purely metabolic/dietary TARA technique — no device required. Tryptophan competes with tyrosine at LAT1: asymmetric damage to 5-HT vs DA.

Clinical Analog

ATD challenge paradigm for depression vulnerability research

Treats

depression vulnerability testing

Neural Impact

4 of 7 neural bands affected

N4 N5 N6 N7

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Scoring

NISS v1.1

0.0None

Validation Status

Theoretical / Not yet validated. This technique has not been independently tested. See the validation dashboard for what has been tested.

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