man so many ppl are in the dark w/nutrition
the only nutrients you cant realistically get from an all fruit diet are the typical non-vegan ones: choline/betaine, b12, vitamin D(tho u can just get from sun so np on that one). everything else including protein you can get from fruit. even vitamin e & k, calcium, zinc, iron AND SELENIUM. one of the richest sources of selenium comes from a fruit, brazil nuts, which aren't nuts technically but the seeds of the fruit of the brazilnut tree. one brazil nut = all selenium for the day. coconuts are also fruit in the same sense and have tons of minerals. some other fruits have surprising amounts of minerals as well. and yes, you can get enough protein from just fruit too. you only need 50g. the diets of the longest lived ppls in the world are always low in protein like 40-50g / day. tho most americans would scoff at eating so little protein.
but no all fruit diet even if u supplement choline & b12 would be low in calories. youre going to approach or pass 2000 calories to get all the nutrients. so its not so much a "diet diet" no good for weight loss
you wont get diabetes either bc of all the fiber
so its really not practical but i felt like being devils advocate for fruit bc so many ppl think of fruit as being just sugar