>I used to live on fruits for some time. Fruits kept me hungry all the time,
>which made me feel like tired. Since I was hungry all the time, I could not
>take my mind off from food related thoughts for long time. It may be just
>for me.

There are high quality fruits and low quality fruits, of course, which
may have an effect.  I would not suggest all fruit, however, and this
is not my definition of fruitarian.  I would add in greens and nuts.
I believe 70% fruit is considered fruitarian, but it's just word
games.
I agree that all fruit presents problems.