Just fruits would be very hard. But plant based diets are very common with minimal supplementation (vitamin b12 is needed and eventually vitamin D, folic acid, iodine, could be added if missing from your diet).

Look up Plant Based Whole Food diets (PBWF). A source I rather enjoy is the “vegan doctor” Dr. Greger and his “daily dozen”: nutritionfacts.org/topics/daily-dozen/

Basically what he says is that if you manage to eat foods from all 12 groups every day, you probably have a good diet.