Nutrition MCP

A remote MCP server for personal nutrition tracking — log meals, track macros, and review nutrition history through conversation.

Help me pay for the servers on Patreon

Quick Start

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

https://nutrition-mcp.com/mcp

On Claude.ai: Customize → Connectors → + → Add custom connector → paste the URL → Connect

On first connect you'll be asked to register with an email and password. Your data persists across reconnections.

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 connectors

MCP Tools

Tool	Description
`log_meal`	Log a meal with description, type, calories, macros, notes
`get_meals_today`	Get all meals logged today
`get_meals_by_date`	Get meals for a specific date (YYYY-MM-DD)
`get_meals_by_date_range`	Get meals between two dates (inclusive)
`get_nutrition_summary`	Daily nutrition totals + goal progress for a date range
`update_meal`	Update any fields of an existing meal
`delete_meal`	Delete a meal by ID
`set_nutrition_goals`	Set daily calorie, macro, and water targets
`get_nutrition_goals`	Get the current daily targets
`get_goal_progress`	Get intake vs. targets for a given day (default: today)
`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
`get_trends`	7/14/30-day averages, std dev, streaks, day-of-week, best/worst day
`get_meal_patterns`	Pre-aggregated behavioural patterns (breakfast effect, late dinner, weekend vs weekday, outliers)
`set_timezone`	Set the user's IANA timezone (e.g. `America/Los_Angeles`)
`get_timezone`	Get the user's configured timezone
`delete_account`	Permanently delete account and all associated data

MCP Resources

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

Self-hosting

1. Supabase setup

Create a Supabase project.
Enable Email Auth (Authentication → Providers → Email) and disable email confirmation.
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.
Copy the service role key from Project Settings → API and use it as SUPABASE_SECRET_KEY.

2. Environment variables

Variable	Description
`SUPABASE_URL`	Your Supabase project URL
`SUPABASE_SECRET_KEY`	Supabase service role key (bypasses RLS)
`OAUTH_CLIENT_ID`	Random string for OAuth client identification
`OAUTH_CLIENT_SECRET`	Random string for OAuth client authentication
`PORT`	Server port (default: `8080`)

Note: The HTML files in public/ include a Google Analytics tag (G-1K4HRB2R8X). If you're self-hosting, remove or replace the gtag snippet in public/index.html, public/login.html, and public/privacy.html.

Generate OAuth credentials:

openssl rand -hex 16   # use as OAUTH_CLIENT_ID
openssl rand -hex 32   # use as OAUTH_CLIENT_SECRET

Development

bun install
cp .env.example .env   # fill in your credentials
bun run dev             # starts with hot reload on http://localhost:8080

Connect to Claude.ai

Open Claude.ai and click Customize
Click Connectors, then the + button
Click Add custom connector
Fill in:
- Name: Nutrition Tracker
- Remote MCP Server URL: https://nutrition-mcp.com/mcp
Click Connect — sign in or register when prompted
After signing in, Claude can use your nutrition tools. If you reconnect later, sign in with the same email and password to keep your data.

API Endpoints

Endpoint	Description
`GET /health`	Health check
`GET /.well-known/oauth-authorization-server`	OAuth metadata discovery
`POST /register`	Dynamic client registration
`GET /authorize`	OAuth authorization (shows login page)
`POST /approve`	Login/register handler
`POST /token`	Token exchange
`GET /favicon.ico`	Server icon
`ALL /mcp`	MCP endpoint (authenticated)

Deploy

The project includes a Dockerfile for container-based deployment.

Push your repo to a hosting provider (e.g. DigitalOcean App Platform)
Set the environment variables listed above
The app auto-detects the Dockerfile and deploys on port 8080
Point your domain to the deployed URL

License

MIT