We know scientifically what excess fructose does to our bodies. regardless of whether you believe minimal is best, maximal is genetic failure, our livers can't process it and by byproduct produce significant Advanced Glycation Endproducts.. AGEs

See The Bitter Truth: http://www.youtube.com/watch?v=dBnniua6-oM

We know that sugar even the fruit based sugar, is directly correlated with bad dental health.

We know that while glucose can feed cancer, only with fructose are the cancer Cells encouraged to multiply. Which with the punt of cancer that's in every single one of us every single day is what's important, preventing that multiplication.

A research team at the University of California, Los Angeles say their findings, published in the journal, Cancer Research, can now help explain other studies that have linked that form of cancer with fructose intake. Dr. Anthony Heaney of UCLA's Jonsson Cancer Center and colleagues said "These findings show that cancer cells can readily metabolize fructose to increase proliferation. They have major significance for cancer patients given dietary refined fructose consumption, and indicate that efforts to reduce refined fructose intake or inhibit fructose-mediated actions may disrupt cancer growth."

We assume to know gut bacteria enough to know fructose feeds the bad ones.

We assume, and have many vitamin and mineral deficiencies that he would suffer. B12, k2, not to mention a horrible ESSENTIAL amino acid intake and a horrible ESSENTIAL fatty acid intake.

from BeyondVeg.com:

Notable Natural Hygiene practitioner at the time related specific problems seen in numerous fruitarian patients. Printed in tandem with the article series was also a separate reprint of an article by Benesh himself [Benesh 1971] that had previously been published in Herbert Shelton's Hygienic Review, detailing a few of the serious problems he had seen develop in people he had cared for who attempted a fruitarian diet--even on high-quality fruits available in season--for more than a few to several months. Benesh listed the following symptoms of people on long-term fruitarian diets that he had seen in his own Natural Hygiene practice, which we should note are not so very different from those mentioned earlier in this interview for the majority of other total-raw-foodists who experience long-term troubles:

Ridged nails, gingivitis, dental caries, dry skin and brittle hair, lowered red blood cell count and low hemoglobin percentage. Over a long period of time (at least one year or more) the blood serum level drops to a point of an impending pathological state if not corrected. Many of them display serious signs of neurological disorders, while some experience emotional upsets and extreme nervousness and often complain of insomnia. When their nutritional program is corrected these signs disappear and the patient finds himself in a much improved state of health.

Another cardinal lack that occurs quite often is a distinct lack of vitamin B-12. This lack of B-12 gives rise to the neurological signs that indicate a serious deprivation of this vital element needed to keep the nervous system operating at a so-called normal level.

People may do well at first, but this is because they are living off of past nutritional reserves, and when the stored reserves run out, the game's over. This is a theme we've probably beaten to death here, but it warrants repetition, especially with regard to fruitarian diets: It is not enough for a diet to be "clean"--it must also be a sufficient diet. Fruitarianism and near-fruitarianism are the worst possible case, because in addition to progressive long-term deficiencies, the body's insulin-production capabilities are being simultaneously overwhelmed with the high carbohydrate load in the form of higher glycemic-index foods containing simpler sugars like glucose, sucrose, and fructose.

If I have more time later, or am simply not so frustrated I may come back and explain even more reasons why this is a ridiculous diet if You know the first thing about the science That we have done in the last decade Alone.

A famous eastern Mystic once said:

The mystery never ends, it cannot end. That´s why it is called a mystery, it cannot be known ever. It will never become knowledge, that´s why it is called a mystery; something in it is eternally elusive. And that´s the whole joy of life. The great splendor of life is that it keeps you eternally engaged, searching, exploring. Life is exploration, life is adventure.

I was just going to say that I ate the SAD (standard American diet) for 22 yeas without an issue and continued for another 7 years on prescription drugs until I found the paleo lifestyle. If you go off my parents my Dad made it to 35 before his heart attack and my Mom made it to 52 before she started having issues. The problem with diet is that you could live your whole life and not know you're slowly killing yourself or you could eat someting one time, have a severe allergic reaction and never touch it again. My brother and parents and in laws have seen the return to health for both me and my husband. They have seen me get off prescription drugs and supplements and still they don't believe.

I never knew how bad off I was until I REALLY tired paelo and now I get it. I thought I was just one of those odd balls with cronic stomach issues and illness. I bet if this guy has issues he won't see that it's his diet/what he's putting into his body, but rather an issue with himself.

I will say that I disagree with raw fruitarianism wholeheartedly and have seen a lot of terrible things come out of it... people proud of their sunken-in eyes and skinny arms as they hold up sugary fruits thinking it's somehow healthy that they're losing muscle and shutting off their menstrual cycles.

That's just personal observation, though. It may not apply to him. I'm not judging him for trying something new, that's his business and if it works all the more power to him. Not something I would suggest or promote, though.

I think that there are many other things than B12 that will potentially go wrong in the short to long term.

I'm thinking mainly of fat soluble vitamins A, K2 and probably E.

Too low of a protein intake could also be a problem.

Of course a lot of raw foodists report feeling great, some who have been doing it for years, but I think it just goes to show have flexible the body can be to different macronutrient intakes. I think, however, that in the long term things aren't so bright and people who eat only fruits freak out when they start having severe teeth problems or become emaciated.

I like him, even if he is a vegan.

He's not an animal rights activist, or an anti-fat anti-meat vegan propagandist. He is someone who experimented with a new diet. Only animal rights people tend to stick with veganism long-term.

I wonder why some can help promote zero carb diets but then bash people who do raw vegan diets at the same time? Humans are omnivores. So I really don't think meat-only diets are more natural or paleo than raw vegan. I know people like the stereotypes of cavemen eating only meat, but they are no more realistic than some Edenic view of early humans eating only fruit in tropical rainforests.

"The Vegetarian Myth" by Lierre Keith describes in detail what a vegan diet can do to the body long-term. It wrecked her health in permanent ways. She also describes the negative cognitive effects on herself and fellow vegans she's known.

If our vegan friend can keep away from the grains and legumes, things might work out quite well indeed. Didn't the This Week in Paleo guy have a clip from some 100+ year old guy who ate basically nothing but fruits and veggies? Nora G suggests that keeping proten low is good for longevity. If our vegan friend could just eat fruits and veggies and stray enough to eat an egg or two a day, he might end up very well off. By the way, I think that sounds pretty paleo.

Having said all that, I still would suggest he get a glucometer and see if all this fruit is spiking is blood sugar. Some fruit is sweeter than others.

Most of this thread makes me yawn, but there's a few who are willing to think outside the box. If you're demonizing fruit right now, IMO you're doing yourself a huge disservice.

Just be honest with yourself... Do you really believe fruit is unhealthy?

I don't exercise as much as everyone thinks (I'm a lazy computer guy) but I CAN if I want to. When you eat fruit, you want to. I've recently moved to Hawaii and will be going epic on the fruit and the exercise. Fruit grows on the side of the road & rolls around on the ground here.

If given a choice, I'd eat almost nothing but fruit now. Since that's not always an option with a busy western life, I toss in other things. I had an omelet tonight because I didn't have enough fruit.

I've gone nothing but up since I left the world of high meat paleo. High meat is an ok survive diet, but not a thrive diet. 2 cents.

Everyone, your body gives you response indicators, such as with the quality/integrity/strength of your skin being the most likely to be the most evident indicator for most people.

Beware of cracks in the skin wherever they may occur, which indicate too much sugar/carbohydrate. So then reduce carbohydrates/sugars and increase protein and fat, especially animal sources, and the cracks should clear up. Return to health.

Dental health is another common problem.

However if you continue too long in the vegan/801010 direction contrary to your body's indications, some permanent damages can occur, such as dental decay, skin changes, body heat changes/ not keeping as warm,....etc.

I dropped meat in my early teens and developed kwashiorkor.Protein malnutrition caused my strongly distended belly.Vegan diet was the silliest decision of my parents and the toughest years of my life. Veganism is an evolutionary mistake. Protein and Fat are as essential as oxygen. Carbs are NOT! (Fiber Menace is a must read). I suggest vegan dieters do some research on original human diet and no money will get their impaired health back on track if they go too far and decide to give this dogma a shot.