It's extremely hard to be a fruitarian and can lead to a lot of health problems due to lack of nutrients such as consuming complete proteins. Generally fruitarians only eat plant based foods that do not harm the plant; some will not eat nuts or seeds because it harms the unborn plant. You would restrict yourself from so much food by doing this. I never knew a fruitarian before, but I was a vegan for six years which excludes all and every animal product as much as possible. There are some things you can not avoid like the glue in books, but doing your best is good enough.