I had theories for everything.
Slow mornings → too many early standups.
Afternoon crashes → context switching overhead.
Can't get into flow after lunch → open office, Slack, the sprint that never ends.
Waking up tired → just how senior engineering feels.
I optimized everything around the degraded system. Scheduled deep work for mornings. Accepted afternoons as a write-off. Built elaborate focus rituals to compensate for focus that shouldn't have needed compensating.
Never once considered the problem might be in the runtime, not the code.
Then I ran an actual profiler.
The Profiler Output
bash
$ bloodwork --micronutrients --full-panel
[CRITICAL] vitamin-d 21 ng/mL target: 40-60
duration: estimated years
impact: energy-metabolism, immunity, cognition, mood
root-cause: works-indoors, latitude >40°, zero sun exposure
[HIGH] rbc-magnesium low
note: serum-magnesium was "normal" — wrong metric
body maintains serum by depleting cells
rbc-magnesium = actual cellular status
root-cause: 4x daily coffee + chronic stress + poor diet
[HIGH] omega3-index 3.4% target: 8%+
impact: neuroinflammation, focus, mood-resilience
root-cause: western diet, no supplementation, insufficient fish
bugs-found: 3 critical
bugs-known: 0
last-diagnostic: never
Three silent bugs. All compounding each other. All producing symptoms I'd attributed to architecture decisions, team dynamics, and the general difficulty of the work.
Root Cause Analysis
Bug 1: Vitamin D (CRITICAL)
vitamin-d affects:
├── energy-metabolism → ATP production efficiency
├── immune-regulation → sick more often, slower recovery
├── dopamine-pathways → motivation, drive, reward
└── cognitive-function → processing speed, memory, focus
running at 21 ng/mL when target is 40-60
= operating core systems at ~35% of optimal capacity
= blaming the application when the OS is misconfigured
Bug 2: Magnesium Depletion (HIGH)
javascript
// The loop nobody told me about
while (true) {
drinkCoffee(4) // accelerates magnesium excretion
experiencePoorSleep() // caused by low magnesium
drinkMoreCoffee() // response to poor sleep
depleteMagnesiumFurther()
// no exit condition
// no error thrown
// just runs forever
}
Bug 3: Omega-3 Insufficiency (HIGH)
no dramatic symptom
no obvious crash
just slow neuroinflammation accumulating:
month 1: focus degrades slightly faster than before
month 6: mood less resilient under pressure
month 12: recovery between deep work sessions noticeably longer
month 24: this is just how things are now
(it isn't)
The Patches
javascript
// patch-001: vitamin-d3-k2.js
export default {
form: "D3", // not D2 — 87% less effective (wrong version)
dose: "4000 IU", // not legacy 400 IU (set in 1970s, never updated)
cofactor: "K2-MK7", // calcium routing — unhandled side effect without this
timing: "08:00",
requires: {
food: true,
fatContent: true // fat-soluble — no fat = null context, silent failure
}
}
// patch-002: magnesium-glycinate.js
export default {
form: "glycinate", // not oxide (absorption rate: ~4% — deprecated)
dose: "400mg",
timing: "22:30", // pre-sleep: where it actually executes usefully
conflicts: ["calcium"], // race condition — separate by 2+ hours
}
// patch-003: omega3-epa.js
export default {
EPA: "1000mg-minimum",
timing: "largest-meal",
preCheck: (batch) => {
if (batch.oxidized) throw new Error("rancid — discard, creates oxidative stress")
// not a neutral no-op — actively harmful
}
}
Sourced from sunday.co.ua — official Ukrainian store for Sunday Natural, German brand, direct shipping from Germany. D3+K2 combined as default. Magnesium in glycinate form. Correct versions without manual configuration.
Deployment and Monitoring
// sprint-1 (days 1-7)
day-03: sleep latency reduced ~10min. flagged as possible placebo.
day-07: no dramatic output changes. maintaining test.
note: 30-day minimum. don't close the issue early.
// sprint-2 (days 8-14)
day-10: sleep quality PR merged to production.
fewer interruptions. more rested at same duration.
magnesium-glycinate confirmed effective in prod.
note: reading about this effect ≠ experiencing it.
// sprint-3 (days 15-21)
day-18: afternoon performance regression reduced.
3PM wall: hard-stop → manageable-dip.
flow-state: more accessible. longer before degradation.
context-switching: cheaper. fewer dropped threads.
// sprint-4 (days 22-30)
day-26: energy curve stable. mood baseline consistent.
no acute signal. no obvious peak.
system running closer to spec.
day-29: stopped tracking.
reason: things felt unremarkable.
note: that was the metric.
Retest Results
bash
$ bloodwork --retest --interval=8-weeks
[RESOLVED] vitamin-d: 43 ng/mL ✅ // optimal range (was 21)
[RESOLVED] rbc-magnesium: normal ✅ // cellular levels normalized
[CONVERGING] omega3-index: 6.3% 🔄 // target: 8%+ (was 3.4%)
critical-bugs-resolved: 2/3
remaining: omega3 converging on schedule
next-retest: 8 weeks
Post-Mortem
Why did this go undetected for two years?
Standard annual bloodwork doesn't check these markers. Serum magnesium masked cellular depletion. Symptoms were vague enough to have twenty other explanations. I never ran out of alternative theories, so I never ran the right diagnostic.
What would I do differently?
// wrong approach (what I did for 2 years)
observe(symptoms)
generate(theories)
optimize(workarounds)
repeat()
// right approach
run(bloodwork)
read(actual-data)
apply(targeted-patches)
wait(30-days-minimum)
retest()
iterate()
Why did the generic multivitamin I tried do nothing?
javascript
const genericMultivitamin = {
ingredients: Array(27).fill("present"),
forms: "cheapest-available",
doses: "label-compliant-minimum",
bioavailability: "theoretical",
result: null // always
}
The Part Worth Sitting With
I had normalized 60% capacity so completely that I'd stopped calling it degraded.
It wasn't burnout. It wasn't the job. It wasn't the particular difficulty of senior engineering or the accumulated weight of too many sprints.
It was three bugs running silently in production for two years while I optimized the application layer and ignored the runtime.
The profiler was one appointment and one week away the entire time.
The baseline you've accepted isn't a feature.
It's a bug that's been in production long enough to look like one.
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