Milton Mills’, right? The one that based his essay on theories of philosopher Plutarch? I’ve read that he lied quite a bit on things…
Let’s do some comparisons based on research outside of the readily available tables.
Digestive ratio (tract length to body length):
Carnivore: 3:1, up to 6:1
Omnivore: 4:1, up to 8:1
Herbivore: 10:1, up to 12:1
Human: 7:1 (Mills claimed 10:1)
Some other numbers:
Lion: 3:1
Bear: 8:1
Kangaroo: 10:1
Horse: 10:1
Cattle: 20:1
Sheep: 23:1 (a sheep has a whopping 25 m for about 1 m body length, that's crazy!)
While for example, elephants have the same ratio as humans (7:1), they are born with sterile intestines and
require bacteria obtained from their mother’s faeces to digest plant matter. Also, for example, panda and sloth, specialised herbivores, have a ratio of 3.3:1 and 4.5:1, while seals and dolphins, carnivores, have ratio 30:1.
If you don't believe, just count it. Human intestines can be up to 10 m long, 8-9m on average, with the large intestine being about 1.5 m and small intestine about 7 m.
Gastric pH:
Carnivore: 1-2
Omnivore: 1-4
Herbivore: 3-7
Human: 1-3 (anything above 3 is considered anomalous, Mills claimed 4)
It’s interesting to note that
human gastric pH is quite like the one characteristic to carrion feeders (animals feeding on dead and rotting flesh).
Canine teeth main use: gripping (holding food to tear it apart) and/or defence.
Human ptyalin production: non-indicative,
highly depends on an individual.
In humans, there is additional pepsin production, of no use whatsoever to a herbivore (breaks down proteins).
Humans cannot survive without vitamin B12 – which can be found naturally only in animal products, such as meat, milk and eggs, never in plants;
a vegetarian diet must include supplements or products such as fortified cereals.
B12 deficiency can cause
permanent neurological damage, depression, memory problems, chronic fatigue and even vitamin B12 anaemia and subsequent death.
All primates chew and have flattened nails, not only humans. Some of them are herbivores, other
omnivores feeding on insects, eggs and small animals like lizards.
Herbivores because they live longer: not necessarily. Greenland sharks, carnivores, reach adulthood at 100 years old. Longfin eels live up to 60 years old, feeding on fish and other small aquatic animals. Tuatara, a carnivorous lizard, lives around 90 years. Bowhead whales (200 years) eat zooplankton, Brandt’s bats (40 years or so) subside on insects etc. etc. All depends on species, comparing those is rather pointless. While it is said that humans that go veg live longer, some studies show very little or even no difference in longevity. Additionally, the data gathered was not analysed properly during many other studies pro-vegan, for example ignoring the influence of smoking, cancer etc.
Herbivores have a large cecum – which stores food material where bacteria are able to break down the cellulose. (For example,
horse cecum is as large as 1.25 m and can store about 20 l.) The human cecum (about 9cm size), also known as the appendix, is not only very short and small but also doesn’t have that function. It is also often cut out without ill consequences. Cecum in carnivores also has no function while in omnivores it can break down plant matter, although not as well as in herbivores.
Also, all classed apes and primates supplement their diet with at least insects or other animal matter like eggs. Insects are animals. While some herbivores also can eat a small amount of animal matter, it causes them ill effects if consumed for longer periods of time. Even a cow or a deer can scavenge a small carcass at times. For example, the deer were seen eating squirrels or rabbits.
Concerning frugivores – they are either omnivores or herbivores with fruits being the
preferred part of the diet. It’s not exactly a vegan, fruit-based classification itself.
Parasites definitely kill any animals eating raw meat, but also raw meat rots easier and faster, hence carnivores have shorter tract lengths.
Some of the resources:
The Evolution of Stomach Acidity and Its Relevance to the Human Microbiome
Dietary habits and mortality in 11 000 vegetarians and health conscious people: results of a 17 year follow up
Small/Large Intestine Length Ratio | Center for Academic Research and Training in Anthropogeny (CARTA)
The Relevance of Comparative Anatomy and Physiology "Proofs"
https://www.gastrojournal.org/article/S0016-5085(00)76703-5/fulltext?referrer=http://europepmc.org/abstract/med/10930389
As a curio:
Nutritional and greenhouse gas impacts of removing animals from US agriculture
Wow, this attack is
so unnecessary. But well, if you really want an answer.
Then
definitely. Also including ants you step on every day you go to work, cut flowers you put in a vase because they look
nice, apples you eat without putting seeds in the ground (to give them a chance to grow, much like with chicken eggs, no?) and spiders and flies you slap with a newspaper because you don't like to have them in your home. I wonder
what argument would they all make if they could speak.
That was probably unnecessary as well.
Look, I never agreed that the meat industry is fine as it is. It's often inhuman, yes, and we can discuss that point all day long, but what you started right now is not discussion but an attack and I don't come to this forum to be ganged up upon, I come to meet like-minded people and
relax with some intelligent conversation. I will know better next time not to open the Pandora's box

(just to make sure, it's
a joke, not intended to offend or to look down on anyone or something).
Again, I'm not trying to argue here or force my views on anyone. That was not my intention
at all. I presented some things that interested me or worked for me as little curiosities we may talk about, exchange information, maybe even, hey, laugh, but only as a matter of healthy discussion, not to offend anyone and definitely not to be attacked - which it definitely feels like at the moment.
You're probably going to debunk some of the things I posted above since I'm no professional, only a hobbyist, but, to be honest, this topic instead of a friendly discussion became both annoying and
tiring. Let us agree to disagree and leave it at that, alright?