This custom GPT allows you to track your nutrition: ChatGPT - Quantified Self Forum Overview
It prompts users to get an API from USDA for accurate nutrition tracking and allergen alerts.
It guides users to keep track of their data with google sheets and/or Nutrition apps.
One of the conversation starters brings them to QS. I will continue doing this for my GPTs that allow users to quantity themselves.
Sounds interesting, especially the idea of integrating USDA API for more accurate tracking of nutrition and allergens. This makes GPT a really useful tool in everyday life. I also liked that there is Google Sheets support - convenient for those who want to keep personal statistics and analyze data over time. The approach of moving to QS seems logical, especially if the goal is to help people better understand their habits and health.
thank you so much for your reply! Have you been using the tool? If you have any more ideas for custom GPTs, please let me know! Thanks again for your feedback! This was the first custom GPT where I learned to make a proper Privacy Policy on a basic HTML site via Google Sites. That was required for using the USDA API. I am a self taught developer and AI has really helped me grow as a Quantified Self-er. 
contact email: reubenxbt@proton.me