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2026 · Health Coach AI · Practical Guide
Box — The Complete Guide
A health app people actually use — because it lives in WhatsApp
A personal coaching agent built on Claude Code + CrewAI, with long-term memory in Qdrant, image OCR through Google Cloud Vision API, and an auto-generated ICS calendar feed. Interface: WhatsApp via the Delegator. State is stored as a single JSON file plus an encrypted SQLite database. In my own setup it accompanies a personal weight-loss and strength program, but this is a coach-agent pattern — not a diet plan. You can adapt it to sleep, running, habit change, learning an instrument, money management, or any measurable personal goal the user sets for themselves.
<5s
Meal intake time
90 days
Meal memory
live
Image OCR
ICS
16:8 windows
A health app people actually use
Because it lives where you already are — WhatsApp. No login, no buttons, no app updates.
Open a nutrition app, search for the product, enter quantities, save...
"I had a Greek salad with chicken" — the data is already in the system
Crowded charts you can't interpret
Weekly report: "You lost 0.8kg, below target. Add more protein"
Does anyone remember how you felt after a heavy meal?
Box asks after the meal "how do you feel?" and logs it
A 16:8 eating window? You forget, and by then it's too late
Calendar subscription — Google Calendar shows you the window
Who is this for?
Here's how:
People who tried health apps and gave up
Box only requires WhatsApp. No UI, no abandonment. Easy to use dozens of times a day.
Anyone following keto / 16:8 / a calorie deficit
Box knows the protocol, reminds you about windows, and calculates macronutrients.
Developers who want to build a similar bot
The code is open, the pattern is clean — coach intake + state management + cron.
Therapists and dietitians
You can spin up a version per client, with isolated state and a more sophisticated interface.
The practical guide
Click any section to open it
Resources & links
Coach ABBA Hatuv on GitHub
The Box codebase — Python + FastAPI + Gemini
16:8 Fasting Research
Articles and benefits of intermittent fasting
Google Cloud Vision API
Image OCR for automatic intake — free up to 1000/month
Kami guide
Box connects to Kami through WhatsApp intakes
Consultation call
Want your own coach version? 30-minute call
Delegator guide
The API Box runs on
Ready for a personal coach in WhatsApp?
The code is open, the APIs are free, and time to first intake — 10 minutes.
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Elad Yaakobovitch
Full-Stack Developer & AI Specialist
Box is built as a coach-agent pattern for any personal goal: health, habit change, sleep, learning, finance. The real value is that the interface is WhatsApp — the place the user already lives, with no new app to abandon after a week. This guide presents the architecture and pattern so you can adapt it to any coaching use case in your organization or personal life.