Nutrition MCP

A remote MCP server for personal nutrition tracking — log meals with calories, macros, fiber, total and added sugar, saturated and trans fat and caffeine (optionally ingredient by ingredient), look up generic foods in USDA FoodData Central and packaged products by barcode in Open Food Facts, record where each nutrient value came from, save meals you eat often and log them again by name, log water, body weight and body measurements, review nutrition history, and import an existing food diary from another app, all through conversation. Alcohol tracking is opt-in and off by default.

Help me pay for the servers on Patreon

Table of Contents

• Quick Start
• Demo
• Tech Stack
• MCP Tools
• MCP Resources
• Self-hosting
  • 0. Get the code
  • 1. Supabase setup
  • 2. Environment variables
  • 3. Google sign-in (optional)
• Development
  • Testing and quality
• Connect to Claude.ai
• Apple Health sync
• Troubleshooting
• API Endpoints
• Deploy
• Support & security
• Data sources
• License

Quick Start

Already hosted and ready to use — just connect it to your MCP client:

https://nutrition-mcp.com/mcp

On Claude.ai: open Nutrition MCP in the Claude directory and click Connect (see Connect to Claude.ai below)

On first connect, sign in with Google or enter an email and password and choose Create account. Your data persists across reconnections. Trouble connecting? See Troubleshooting.

By connecting you agree to the Terms of Service; how your data is handled is in the Privacy Policy.

Switching from another tracker? See the nutrition-app alternatives — how it compares to MyFitnessPal, Cronometer, Lose It!, MacroFactor, Yazio, and Lifesum. Bring your history with you: say "import my meals" and an importer opens in the chat, where you pick the CSV you exported from your old app, map its columns, and check what will be added before anything is saved. Exports from MyFitnessPal, Cronometer, Lose It! and MacroFactor are recognised automatically; any other CSV works by mapping its columns yourself. In clients that can't show in-chat panels, paste the export instead and the AI imports it for you. If your export has an alcohol column and you want it kept, turn alcohol tracking on before importing — the importer skips that column while tracking is off, and re-importing the same file later won't backfill it.

Demo

Read the story behind it: How I Replaced MyFitnessPal and Other Apps with a Single MCP Server

Tech Stack

• Bun — runtime and package manager
• Hono — HTTP framework
• MCP SDK — Model Context Protocol over Streamable HTTP
• Supabase — PostgreSQL database + user authentication
• OAuth 2.0 — authentication for Claude.ai and other MCP clients: per-client dynamic client registration (RFC 7591) with exact redirect-URI matching, mandatory PKCE (S256), token-endpoint client authentication (none, client_secret_post, client_secret_basic), codes and refresh tokens bound to the client they were issued to, iss on every authorization response (RFC 9207), and client secrets, access tokens, refresh tokens and codes stored only as a SHA-256 hash. Access tokens last 24 hours; refresh tokens last 90 days from their last use and rotate on every refresh; expired tokens and never-used client registrations are swept hourly

MCP Tools

Tool	Description
log_meal	Log a meal with description, type, calories, macros, fiber, total and added sugar, saturated and trans fat, alcohol, caffeine (mg), notes — from text or a photo of your plate; each value records its source
start_meal_import	Open the in-chat CSV importer: pick an export from another app, map its columns, preview, confirm
bulk_import_meals	Write up to 50 imported rows per call — each row validated, duplicates skipped so a re-send is safe while the timezone is unchanged
lookup_barcode	Look up a packaged product's label nutrition by barcode via Open Food Facts, including added sugar when listed (read from a photo or typed; data © OFF contributors, ODbL)
search_foods	Search USDA FoodData Central generic foods by English name; up to 10 candidates with their ids and macros per 100 g
get_food_macros	USDA FoodData Central values for one generic food by its id, per 100 g or scaled to amount_g, with its listed portion sizes
get_meals_today	Get all meals logged today, one compact line per meal with its id; detail: "full" adds notes
get_meals_by_date	Get meals for a specific date (YYYY-MM-DD), one compact line per meal; detail: "full" adds notes
get_meals_by_date_range	Get meals between two dates (inclusive), up to 31 days per call; one compact line per meal, detail: "full" adds notes
search_meals	Search past meals by keyword, grouped into recurring variations (counts, last logged, typical macros)
get_nutrition_summary	Daily nutrition totals + goal progress for a date range, up to 92 days per call
update_meal	Update any fields of an existing meal
delete_meal	Delete a meal by ID
save_meal	Save a meal under a name, with values per serving and optional ingredients, to log again later
log_saved_meal	Log a saved meal, scaled by servings, with single ingredients set to the amount eaten or left out
get_saved_meals	List saved meals with their values and ingredients, optionally filtered by name
update_saved_meal	Change a saved meal's name, values or ingredients; meals already logged from it keep theirs
delete_saved_meal	Delete a saved meal; meals already logged from it keep their values
set_nutrition_goals	Set daily calorie, macro, fiber and water targets to reach, total-sugar/added-sugar/alcohol/caffeine limits to stay under, plus an optional target weight
get_nutrition_goals	Get the current daily targets and limits
get_goal_progress	Get intake vs. targets and limits for a given day (default: today), plus latest weight vs. target
log_water	Log a hydration entry in milliliters
get_water_today	Get today's water intake total and entries
get_water_by_date	Get water intake for a specific date
delete_water	Delete a water log entry by ID
log_weight	Log a body-weight measurement in kg or lb (converted and stored server-side)
get_weight_today	Get today's weight entries
get_weight_by_date	Get weight entries for a specific date
get_weight_by_date_range	Get weight entries between two dates (inclusive), grouped by day, up to 366 days per call
get_weight_trends	Weight trend: smoothed trend weight, weekly rate, latest, overall change, min/max, goal progress; widget zooms to 90 days, 1 year or all history
update_weight	Update an existing weight entry
delete_weight	Delete a weight entry by ID
set_weight_unit	Set the preferred weight unit (kg or lb; null to clear)
log_body_measurement	Log a tape measurement (waist, hips, neck, chest, shoulders, upper arm, forearm, thigh, calf) in cm or in
get_body_measurements	List body measurements by day, optionally for one site; last 30 days by default, up to 366 days per call
update_body_measurement	Update a measurement's value, unit, time or notes (the site is fixed)
delete_body_measurement	Delete a body measurement by ID
set_length_unit	Set the preferred length unit (cm or in; null to clear)
get_trends	7/14/30-day averages, std dev, streaks, best/worst day; group_by week/month/quarter/year averages per logged day vs targets then in effect
get_meal_patterns	Pre-aggregated behavioural patterns (breakfast effect, late dinner, weekend vs weekday, outliers)
export_all_data	Export everything stored about you — logs, saved meals and ingredients, where each nutrient value came from, goals, profile, account, telemetry, app connections — as one ZIP of CSVs + README; 60-minute link
get_profile	Get timezone (+ local date/time), widget language, weight and length units, widget display and alcohol tracking in one call
set_timezone	Set the user's IANA timezone (e.g. America/Los_Angeles)
set_language	Set the UI language for in-chat widgets (dashboards, charts) — not the language the AI replies in
get_current_time	Get the current date and time in the user's timezone, plus the UTC instant — for hosts with no clock in context
set_widget_display	Enable or disable the in-chat visual widgets (dashboards, rings, charts); enabled by default
set_alcohol_tracking	Turn alcohol tracking on or off (off by default) and choose US standard drinks or UK units; turning it off hides alcohol rather than deleting it
delete_account	Permanently delete the user's Nutrition MCP account and all data it stores about them

MCP Resources

URI	Description
nutrition://weekly-summary	Rolling 7-day digest (averages vs targets, best/roughest day) for proactive pulls

Self-hosting

0. Get the code

git clone https://github.com/akutishevsky/nutrition-mcp.git
cd nutrition-mcp
bun install
cp .env.example .env   # fill in real values as you go through the steps below

Requires Bun 1.x (matches the Dockerfile's oven/bun:1 base image; no exact minor version is pinned).

Making it yours: The public site includes the maintainer's personal bits — Google Analytics, Microsoft Clarity, Patreon/GitHub/contact links, and the nutrition-mcp.com domain. Run bun run gen:all to produce the public pages, then bun run depersonalize to strip the personal bits in one pass (the consent-gated analytics snippet, the consent banner and the footer "Cookie settings" button, plus the analytics CSP hosts, the Support/Contact sections, social links, and the domain → a your-domain.com placeholder). Use bun run depersonalize --dry to preview without writing. Afterwards, swap in your own public/og.png, favicon.ico, favicon.svg, apple-touch-icon.png, icon-192.png and icon-512.png, replace the domain placeholder with your real domain, and rewrite the analytics paragraphs of the privacy policy and terms (src/copy/legal*.ts), which still name both services. Its edits to the generated pages are undone by bun run gen:all — to regenerate, first change the sources it reads from (in scripts/site-partials.ts, either your own GA_MEASUREMENT_ID / CLARITY_PROJECT_ID, which analyticsHead() loads only after a visitor accepts the consent banner, or ANALYTICS_ENABLED set to false to drop the snippet, banner and button altogether; SITE in src/routes.ts), then run it again. This script only touches the generated files under public/, the import widget's support address, src/index.ts and the security.txt contact in src/security-txt.ts (blanked, so /.well-known/security.txt answers 404 until you set your own) — it doesn't touch this README or SECURITY.md, so if you're publishing your own fork, rewrite SECURITY.md for your deployment and also edit or remove the Patreon line near the top of this file and the Medium link in Demo.

1. Supabase setup

1. Create a Supabase project.

2. Enable Email Auth (Authentication → Providers → Email) and disable email confirmation.

3. Apply the schema. The full schema lives in supabase/migrations/. With the Supabase CLI:

   supabase link --project-ref <your-project-ref>
   supabase db push
   

   This creates every table, index, RLS policy, and foreign key the app needs. No local Postgres is involved — migrations run against your hosted project.

4. Copy the service role key from Project Settings → API and use it as SUPABASE_SECRET_KEY.

2. Environment variables