Hi @amidn, I use the free version of the Zero app - https://zerolongevity.com/. I had not heard of the fasting-mimicking diets but it does sound interesting although I would definitely not like missing some meat. I eat a very limited amount of red meat but do like chicken. For others that might be interested, here's an article on the topic:
-- Fast track to health? Inside the Fasting Mimicking Diet
https://www.uclahealth.org/news/article/fast-track-health-inside-fasting-mimicking-diet
You might also find the following discussion helpful:
-- Low-carb healthy fat living. Intermittent fasting. What’s your why?
https://connect.mayoclinic.org/discussion/low-carb-healthy-fat-living-intermittent-fasting-whats-your-why/