A forager friend of mine has just completed participating in a gut biome study (in conjunction with the UK Zoe project), where he and other foragers have been only eating wild foraged food for 3 months. A pretty good achievement for him (although he lost about 20kg over the 3 months). He blogged daily photos of what he ate on insta: https://www.instagram.com/rural_courses/
I suppose it's best to start with 1 or 3 months of 100% foraged food like they are doing. If that works, later experiments can find out whether less than 100% is enough.
