I wish I could be fruitarian all the time, it makes me feel great, but I just can't seem to stick to it.
Here is what I do for a couple of weeks every now and then, just to clean myself out and boost my energy level.
I eat nothing but berries and melons for 2 days, then I slowly start adding other fruits and eat a big variety for a couple of more days, then I add veg fruits, nuts, seeds, rice and beans for a couple of weeks.
I eat only raw uncooked foods, with the exception of the rice and beans.  
All organic, no sweeteners or salt, no spices or herbs, no hot drinks or ice teas etc.  just fresh water and raw whole foods.  I use lemon juice and fresh salsa for seasoning.  I eat one banana every morning, no more than that.  I eat as much melons and berries as I want, but everything else is in small portions.  I never ever eat roasted nuts.  Only raw unsalted nuts, like almonds, walnuts, pecans, macadamias, and only a handful a day.
I eat rice and beans together once a day, usually at lunch with salsa.
I don't eat salad or any leafy or root vegetables.  Only the fruit of the vine, or the sex organ of the plant.  Never eat the plant, just the seed, pod, berry, flower etc.  lettuce is a no no.  leaves are too toxic, no herbs teas or spices either.  This is a great flush and I loose weight too.  Try it, you won't believe the energy you'll get.