@Mybalconyiscracking
Go and eat a bacon sandwich, then see how you feel?
Mybalconyiscracking NOT an appropriate response on a VEGAN forum - why are you even here?!
OP, I would not recommend a strictly fruit only diet to anyone. You would quickly become deficient in many vitamins and nutrients. Those who claim to feel super healthy and full of energy as a fruitarian are not being truthful. I could not imagine living off only fruit, I would be so sick of it, especially in the UK where the native fruit here would not provide your body with everything it needs. Even if you did eat only fruit, you would need access to tropical and unusual fruits from many different countries to even get close to nourishing your body properly - which would be much less environmentally friendly and healthy than sourcing vegan locally grown produce in the UK.
Humans can live very happily and healthily on a vegan diet, even if you choose strictly wholefoods and non of the processed stuff, with a wide variety of fruits, vegetables, grains, pulses, beans, etc. with of course supplements such as B12.
Life is too short. You can care for the animals, the environment, your health and that of other people's without restricting yourself so much :)