Privacy Policy

Last updated September 20, 2026

Fuel is a nutrition tracker run by one person as a side project. This page explains what data Fuel stores about you and why. Fuel does not run ads, does not sell data, and does not share your meal data with anyone except an AI assistant you personally connect and authorize.

What Fuel stores

Account info: email address, name, password hash (or nothing, if you sign in with a magic link), and timezone.
Nutrition data: the meals, food items, and quantities you log, plus any daily goals you set.
Connections: if you link Fuel to an AI assistant (ChatGPT, Claude, Grok, or another MCP client), Fuel stores an OAuth connection record and the permission scopes you approved — never the assistant’s own conversation content.
Support and feedback: if you contact support or submit a feature request, Fuel stores your email and message so it can respond and track the request.
Security logs: technical records (audit events, rate-limit counters) used to detect abuse and debug issues. These do not include your meal content.

How it’s used

Solely to run the product: showing you your own data, calculating totals and summaries, authenticating you, and letting an assistant you’ve authorized read or log meals on your behalf. Fuel does not use your data for advertising, profiling, or training third-party models.

AI assistant connections

Connecting ChatGPT, Claude, Grok, or another assistant uses OAuth: you sign in to Fuel and approve exactly which permissions (reading meals, writing meals, or both) that assistant gets. Access tokens expire after one hour and the connection itself after 30 days of inactivity. You can revoke a connection at any time from your account page, or by deleting your account.

Cookies

Fuel sets one session cookie to keep you signed in. There is no advertising or cross-site tracking cookie.

Your data, your control

Export everything Fuel has stored for you as a JSON file from your account page at any time.
Revoke any AI assistant connection from your account page at any time.
Delete your account from your account page, which permanently removes your meals, food items, and connections. Support and feature request history is kept but disassociated from your account.

Changes

If this policy changes in a meaningful way, the date above will be updated. Given this is a small, independently run project, check back occasionally rather than expecting an email notice for every change.

Contact

Questions about your data? Email 98ray.plenums@icloud.com or use the support page.