Effortless Nutrition Logging via LINE Photos to Google Sheets

Transform your daily nutrition tracking from tedious manual logging into an effortless photo-based system. This n8n workflow lets you send meal photos directly to your LINE bot, where Google's Gemini 1.5 Flash AI automatically identifies food items and logs detailed nutritional data to Google Sheets—perfect for health-conscious individuals and diet trackers in Japan.

What this workflow does

Simply snap a photo of your meal and send it to your personalized LINE bot. The workflow leverages Gemini 1.5 Flash to analyze your food photo and extract precise nutritional information including calories, protein, fat, and carbohydrates. Each meal gets automatically logged to your Google Sheets with timestamps and user IDs for comprehensive tracking.

The system maintains running daily calorie totals and sends instant warnings when you exceed your personal calorie limit. Every Monday morning, you'll receive an automated weekly nutrition summary delivered straight to your LINE account, complete with AI-generated advice to optimize your dietary habits.

Use cases

• Diet management: Effortlessly track macronutrients without manual calorie counting or food database searches
• Fitness accountability: Monitor daily nutrition goals with automated alerts and weekly progress reports
• Health monitoring: Build comprehensive meal logs for medical consultations or nutritionist appointments
• Habit formation: Develop consistent nutrition awareness through simple photo-based logging

Technical details

This workflow integrates LINE Messaging API with Google Gemini AI and Google Sheets using n8n's webhook, HTTP request, set, code, and conditional logic nodes. Setup requires a LINE Messaging API channel, Google Gemini API key (free tier available), and basic Google Sheets configuration.

The workflow is fully customizable—adjust calorie limits for different dietary goals, add Slack notifications for fitness accountability groups, or modify Gemini prompts to track additional nutritional metrics. All core integrations operate on free tiers, making this an accessible automation solution for personal nutrition management.