Medical student's apparent celiac disease responded to giardiasis treatment

> But doctors never definitively diagnosed Johnson with celiac disease. His doctors wanted to do a biopsy to get a definite answer, but that would require eating gluten again, something Johnson wasn’t willing to chance.

How about this for an app idea? Does this already exist?

Use the app to record all the food consumed. Use AI to read restaurant menus, cereal boxes, ect. Give the user a survey every 1 hour. Make eating A/B testing strategies, for example, have the user not eat dairy for a day, then not eat gluten, ect.. Do some calculations and figure out what foods cause what symptoms.

I've had this web app about 15-20 years ago, until the tech got obselete. It was popular, yet little bit more simpler Now I saw that somebody made similiar app...but without proper execution.. If you make one, please don't focus on automating photo taking and that stuff, but the simple ui + simple results

Ingredients lists are not enough.