01
Your wearable
Whoop, Oura or Apple Watch — recovery, HRV and sleep flow in read-only. Official APIs, nothing scraped, nothing mimicked.
Food × wearable — private waitlist open
See which foods move your recovery.
FoodSignal connects the food log you already keep with the wearable you already wear — and runs real statistics on your own data to show which meals move your next-morning recovery, HRV and sleep. No CGM. No guesswork. Methods shown.
Scroll
0+Days of meals logged
against one body
against one body
0Adversarial tests
behind every claim
behind every claim
0CGMs, patches or
new hardware required
new hardware required
~0weeksOf paired days
to your first signal
to your first signal
The system
You already own
every sensor.
Your wearable scores every night. Your food app logs every meal. Nobody holds one against the other — that missing join is the product.
02
Your food log
Keep logging in Cronometer, MacroFactor, Yazio or MyFitnessPal — FoodSignal reads the diary you already keep via Apple Health. No new habit.
03
The battery
Placebo check, out-of-sample split, permutation test, block-bootstrap CI, confounder controls — run on your data, not on averages.
04
The verdict
Every insight carries its evidence level — validated, pattern, or not enough data yet. When your data can't support a claim, the app says so.
05 — The difference
See the engine →
Statistics, not vibes
Trackers display your food next to your scores and let you guess. FoodSignal is the join: it cross-examines every meal against every next morning — and keeps only what survives.
The engine
It doesn't display.
It proves.
Built on a founder result that survived the full battery: eating quality predicting next-morning recovery across 400+ logged days.
Signal → Pattern → Conclusion
Every meal, weighed against the morning after — every night. When a pattern survives the battery, it becomes one clear call.
Signal
Late meals.41
Sugar.34
Diet score.52
Alcohol.29
Protein.22
Fiber.18
Pattern
Conclusion
Better-eating days → +12 next-morning recovery → evidence: validated
Pattern held across 46 paired days
Placebo pass · Permutation p < .05
The insights
Questions your data
can finally answer.
Example signals from the founder's 400+ logged days — every claim battery-gated. Your numbers will be your own.
01Meal timingPattern
Last meal before 19:30 → +14 min deep sleep, same night.
02FastingPattern
16:8OVERNIGHT FAST
16 H FASTED
8 H EATING
16-hour overnight fast → next-morning recovery +6.
03AlcoholValidated
2+ drinks → recovery −16 · sleeping HRV −3.4 ms.
04CaffeineValidated
Espresso after 14:00 → deep sleep −11 min that night.
Founder data, battery-gated — illustrative of the product, not a promise about yours
The protocol
Three weeks.
Zero new habits.
No streaks. No points. You keep living — the statistics do the discipline.
01
Connect
Apple Health, Whoop or Oura — read-only, two minutes, your data stays yours.
02
Keep logging
In the food app you already use. FoodSignal pairs each day with the morning after.
03
Get your signal
After ~20 paired days: which foods move your recovery — each claim carrying its evidence level.
Manifesto
Your wearable already knows.
The answer sits in data you make every day.
We built the statistics that listen —
and say only what survives.
FoodSignal — a Longevity Directive product
Own your signal.
Founding members: the first 200 lock $39.99/yr for life — later $59.99/yr. TestFlight seats open in referral order.
You're on the list
#– of –
Move up 5 spots for every friend who joins with your link — TestFlight seats are admitted in queue order.
Private waitlist · 2026 · Email used for launch updates only