A life is a life.
How are honey bees any higher or lower on scale of worth than carrots?
You choose where to draw your own lines.
I would say the majority of people (vegans) draw the line at being sentient considering all animals perceive, feel and express emotions (except for questionable beings such as oysters which is still unknown because of the animal organs but lack of a CNS) which is not only observed but backed up with the anatomy of their systems. As i have already referred to in another thread plants have not shown any of these characteristics and lack the systems to be considered sentient.
The idea sounds interesting though, i would prefer to be eating products that have fallen of a tree rather then killing the plant itself if that could be successfully done.
However if you look at some of the long-term health risks, you find the majority of fruits contain small amounts of certain nutrients and thus plenty of UN-supplemented fruitarian diets are often deficient and most supplements will be extracted from plants so by definition couldn't be taken. An example is OMEGA 3 EPA and DHA longer chains which is extracted from algae (two sources only being fish and algae).
A potential meet around could be attempting to be a fruitarian as much as possible but in a strict sense fruitarian diets aren't recommended because of the long-term health effects/risks and can only work with strict daily choices combined with supplements, it's a lot less flexible then being able to eat vegetables in terms of meeting daily requirements. Although you've said you don't care about the health risks, it's something that's hard to be considered natural if it negatively impacts our development.
Another point would be the techniques farmers use in obtaining fruit, will still cause plants to be killed as well as all the pesticides for insects. The way it is unless you have the time and right conditions to grow everything needed to reach your daily requirements as well as employing the most ethical farming techniques possible you can't stop all lives being wasted in our current system sentient or not.
The differences between plants and animals in terms of structure and habitat is quite large (same with bacteria, soil etc), the line after animals in terms of what is causing suffering gets quite confusing, although based on all the evidence we have it's been concluded that plants aren't sentient, if they are then where exactly does the line get drawn. The philosophies in saving lives gets quite confusing; do we keep it on products falling off such as fruits, does it extend to bacteria? even soil? How is the fruit commercial grown to ensure this? do those fruits contain any cells of perceiving? In the context of what we know, we can say animals have emotions, feel pain and perceive our world in a non-mechanical way. If we are wrong about plants then i couldn't be sure if such a line can even be drawn about "ethical" eating and the thought of that is rather confronting considering we have to obtain the right nutrients to develop somehow.
Just trying to put some thought on the topic and not trying to cause any frustration or ignorant statements of "plants don't feel pain, so i don't care about them". This topic had divulged quite far from being a question if anyone was a fruitarian and i am probably not helping in that respect lol.
