From June 16th

I found this on the internet. Thought it was interesting.
If you try to live on only raw vegetables, you will need to eat 20 pounds (9.1 kg) per day, just to satisfy your calorie requirements. That's a lot of food to eat each day! Consider the time required to eat (and excrete) so much food on a daily basis. Indeed, you would be forced to lead a life parallel to that of the gorilla--a life that consists primarily of eating, excreting, and sleeping. (It's no coincidence that many raw-foodists seem to be primarily focused on the topic of food and eating it for much of their day.)
A diet of exclusively raw vegetables provides challenges over and above the volume problem. Many common vegetables are diuretic: asparagus, celery, dandelion greens, fennel bulb, onion, parsnip, and parsley.
The ultimate result of a diet high in diuretics can be chronic dehydration--which can cause serious problems in and of itself. This comment also applies to vegetable juices, specifically green juices (which usually have a celery juice base and/or include other diuretics).
Later…when he’s talking about an all-fruit diet:
Needless to say, that explains why many fruitarians experience the symptoms of excess sugar consumption (frequent urination and thirst, fatigue, sugar highs/blues, etc.). Also, it seems reasonable to regard a diet in which sugar is the overwhelmingly predominant calorie source (little fat, starch, or protein) as a form of "sugar addiction."
The table shows that fruit juices are high in calories and are a concentrated food: you can satisfy your calorie requirements with 3.7 quarts (3.5 liters) of juice. On the surface, it appears that juices are a solution to the calorie paradox. However, consuming this amount of juice would give you a very large dose--approximately 1.066 pounds (0.483 kg)--of sugar each day. Such a large quantity of sugar may cause negative side-effects, particularly in the long run.
Trying to live on a diet of only dried fruit is not a good idea. Dried fruits are notorious for causing flatulence. The concentrated sugar may, in some individuals, promote or aggravate reflux--digestive acids coming up out of the stomach.
Later….when’s talking about neutral and acidic fruits:
However, a warning applies here again, which the fruit advocates often don't bother to tell you: consuming large amounts of acid fruits may cause serious damage to your tooth enamel.
In another article:
Foods that contain oxalate and may increase risk of kidney stones: beets, chocolate, coffee, cola, nuts, rhubarb, spinach, strawberries, tea and wheat bran.