Fruit and Nutarian

For three years I was vegetarian, then vegan for 4 years, and then all I ate for about 4 months, was fruit and nuts...
I am back to omnivorous diet now.
I am sure you can understand vegetarian, even vegan.
But, the reason I went to fruit and nuts, is so that I did not have to kill an actual plant to eat. As in, all I ate fell from the tree...
I can tell you, I still felt fine on that diet.

When you consider the ethic of such a diet, what are your thoughts?
(Perhaps bear in mind vitamin tablets, etc. as well as man-made foods)