Your brain runs on a neurotransmitter system that is highly responsive but chronically under-resourced. You have two overlapping biological factors that create this: you produce fewer neurotransmitters than most people, and you break them down faster. The result is a system with a lower resting baseline — but one that responds intensely when properly stimulated.
This explains a lot. The drive you feel when engaged in meaningful work. The depth of positive emotions. The crashes after stimulation. The need to keep moving. None of this is personality. It's biology.
Think of it like a sports car with a small fuel tank. It performs intensely when the engine is running — but it also runs out of fuel faster than a regular car, and it needs higher-quality fuel to run cleanly. The performance is real. So is the maintenance requirement.
Your key strengths: Intense drive when engaged. Deep positive emotional states. Strong focus in structured environments. High motivation when working toward meaningful goals.
Your key vulnerabilities: Depletes faster than average. Needs consistent input (sleep, nutrition, exercise, no cannabis) to stay functional. Without those inputs, the system deteriorates noticeably and quickly.
Neurotransmitters are the chemical signals your brain uses to regulate mood, motivation, focus, and emotional experience — dopamine (drive and reward), serotonin (emotional stability and well-being), and norepinephrine (alertness and stress response).
Your system has two distinct characteristics that work against each other:
The MTHFR variant affects an enzyme that produces a critical cofactor called BH4 — the molecule your body needs to make dopamine and serotonin. Without enough BH4, production slows at the source.
MAO-A is an enzyme that breaks down neurotransmitters once they've been used. Your version runs at roughly 150% of normal speed. So anything produced gets cleared faster than average.
The additional factor is your COMT gene, which clears dopamine from the prefrontal cortex (the part of your brain responsible for decision-making and focus). Yours runs at intermediate speed — so when dopamine is present in your brain's executive centre, it lingers slightly longer than average. This contributes to the intensity of focus and emotional experience when you're stimulated.
Combined: low resting baseline, fast depletion, but intense peaks when dopamine and serotonin are actively triggered.
Emotional intensity: When something triggers a dopamine or serotonin response — a meaningful conversation, a win, physical exercise, a person you love — the signal is stronger and lingers slightly longer than average. This produces depth of feeling, not just surface-level emotion.
The love you feel for your partner: That felt experience is a serotonin and dopamine event. Your system, when it's working cleanly and unimpaired, produces these signals at full intensity. The depth is real — and it's yours.
Anxiety and overthinking: Your fast MAO-A doesn't just deplete the good. It depletes everything, including norepinephrine — the neurotransmitter involved in focus and stress response. When the system is depleted, your prefrontal cortex (the thinking brain) doesn't get the signal it needs to slow down the stress response. The result is mental loops that run without resolution. This isn't anxiety as a personality trait — it's a depleted regulatory mechanism.
The need for stimulation: When your baseline is low, your brain looks for ways to get dopamine back up. This shows up as drive toward meaningful work, social engagement, or exercise — which are all healthy routes. It also shows up as seeking behaviour when those healthy routes aren't available. Understanding this is not a judgment — it's knowing your system.
Deep positive states: When you're well-resourced (slept, trained, eating well, no depleting substances), the same system that creates intensity in negative states creates it in positive ones. This is why the felt experience of being in love, of achieving something meaningful, or of genuine connection can be so profound. Your system experiences these things at higher amplitude.
What it does to your system: Cannabis activates receptors that temporarily reduce dopamine activity in the brain's reward centre. For a depleted system, this initially feels like relief — the constant low-level seeking quiets down. At the same time, it amplifies serotonin signals in the short term, which is why emotions feel deeper when using it.
Cannabis disrupts REM sleep — the sleep phase where your body regenerates BH4, the molecule needed for dopamine and serotonin production. Every night of disrupted REM means the next day starts with less production capacity. Over weeks, this compounds: less produced, more depleted, emotional depth reduces. The "feeling things" that disappears is not a psychological change — it's the substrate for those feelings being slowly used up.
Why you feel it more than most: Your MAO-A fast leaves you with a lower neurotransmitter baseline to begin with. When cannabis disrupts the replenishment pathway, there's less reserve to absorb the impact. The crash is proportionally larger than for someone with a higher resting baseline.
Outcome: Short-term relief. Long-term progressive blunting of the emotional depth that is your most valuable asset. The emotional numbness is not the cannabis blocking feelings — it's the production system being starved.
Your body processes caffeine at an intermediate rate — slower than average but not at the extreme end. The practical effect: a coffee at 2pm is still measurably active in your system at 9–10pm. This disrupts sleep quality, which in turn disrupts BH4 regeneration (the same pathway cannabis affects). The hard cutoff at 2pm is not arbitrary — it's based on your actual metabolism rate.
The additional factor: caffeine triggers catecholamine release (stress hormones). With your intermediate COMT clearance, these signals in your brain's executive centre linger slightly longer than average. Late caffeine = heightened evening activation = poor sleep = depleted next day.
Alcohol primarily affects REM sleep — the same regenerative phase cannabis disrupts. The effect is less severe and shorter-lasting than cannabis, but follows the same pathway: poor REM → reduced BH4 → reduced NT production next day. Keeping alcohol occasional and earlier in the evening limits the impact on sleep architecture.
When your system is well-resourced — consistent sleep, regular training, no depleting substances, good nutrition — the same biological profile that creates vulnerability also creates genuine capability.
The performance is real. The conditions are non-negotiable. Unlike many systems that produce decent output regardless of inputs, yours is sensitive to those inputs in both directions. The same sensitivity that makes the highs high also makes neglect costly.
Because your system has less reserve than average, the failure modes are predictable and happen faster than they would for most people.
| Trigger | What breaks first | What it feels like |
|---|---|---|
| Poor sleep (1–2 nights) | BH4 regeneration drops → NT production reduced | Flat, low motivation, things feel harder than usual |
| Regular cannabis use | Progressive BH4 depletion, dopamine baseline drops | Emotional blunting, reduced depth of feeling over weeks |
| Missed training (4+ days) | Primary dopamine regulation mechanism removed | Restlessness, increased seeking behaviour, lower mood |
| High stress without recovery | MAO-A accelerates breakdown of stress hormones AND neurotransmitters simultaneously | Rapid depletion, anxiety, difficulty concentrating |
| Low protein intake | Reduced tryptophan and tyrosine → less serotonin and dopamine substrate | Subtle but cumulative — mood and motivation degrade |
Emotional flatness or reduced depth of feeling is the clearest early indicator that the system is depleted. It usually precedes motivation loss and anxiety increase. Catching it early — and addressing the input (sleep, nutrition, training) — is far easier than recovering from a full depletion cycle.
These rules are derived directly from your biology. They are not general wellness advice — they are specific to how your system works.
A few inputs determine the majority of your day-to-day functioning. Getting these right produces disproportionate results.
| Gene | What it does | Your variant | Effect |
|---|---|---|---|
| MAO-A | Breaks down dopamine, serotonin, norepinephrine after use | Homozygous fast (TT) | ~150% breakdown rate — dominant finding |
| MTHFR | Converts folate into its active form for neurotransmitter production | Compound heterozygous | ~40–50% enzyme activity — impaired production |
| COMT | Clears dopamine/norepinephrine from the prefrontal cortex | Val/Met heterozygous | Intermediate clearance — moderate effect |
| CYP1A2 | Metabolises caffeine | Heterozygous (AC) | Intermediate — ~6-8hr half-life |
| APOE | Cholesterol transport and brain neuron maintenance | e3/e3 (optimal) | No elevated cognitive risk |
| 5HT2A | Serotonin receptor density | All wild type | No genetic variant — sensitivity is secondary to MAO-A depletion |
| BDNF | Brain-derived growth factor — supports neural maintenance | Val/Val wild type | Normal function — no deficit |
Note: "Wild type" means the standard, non-variant form. The absence of variants here is a confirmation that the sensitivity attributed to these genes in some commercial reports was not supported by the actual SNP data.