Log Food Calories from Images to Google Sheets via LINE & OpenAI Vision

This n8n workflow integrates LINE Messaging API webhook to capture messages from users. It uses a Switch node to differentiate between text and image inputs: text prompts get direct AI responses via LINE, while images are downloaded from LINE's API, analyzed by OpenAI's Vision model to detect food items and estimate calories, then formatted as JSON.

Results including detected dishes and calorie counts are automatically appended to a specified Google Sheet for easy tracking. A confirmation message with details is sent back to the LINE user in real-time, ensuring seamless interaction.

Ideal for fitness apps, personal trainers, or nutrition coaches building LINE-based calorie trackers. Benefits include hands-free logging, accurate AI-powered estimates, centralized data in Sheets for analysis/export, and no coding required. Save hours on manual entry and scale to multiple users effortlessly.