In Revelation 13:8, we read that Christ is the Lamb slain from the foundation/creation of the world. This is a clear indication that God knew precisely what would happen and had made arrangements for man as a fallen creature, even from the point of creation.
It is not the food situation which changed the lifespan of man. If it were, then vegetarians would be living much longer lives even now. Rather, man's first exposure to radiation was as a result of the Flood. Radioactive materials were not on or in the crust in early earth (standard geology, not a creationist or new thing), and the bursting waters from below the crust (see Genesis 7:11) would have carried up with them tons upon tons of pulverized material from under the crust, including rather large amounts of radioactive elements. It may well have been this exposure to the eight people alive after the Flood which caused the mutations which limited growth. My own suspicion is that one of the mutations may well have been related to our ability to produce telomerase, the enzyme which allows telomeres at the ends of chromosomes to repair themselves. They shorten each time a cell divides, and as things stand now, they produce an upper limit on the number of times that can happen, for they cannot repair themselves (interestingly, cancer cells can and do produce telomerase, thus making them 'immortal').
Now, let's take a look at your other points:
Omnivores have teeth that bypass in a scissor like motion.
Humans have teeth that land on top of each other with only the front bypassing.
In other words, we have both bypassing and grinding teeth. Excellent for omnivores.
Omnivores have almost no side to side action in their jaws.
Humans have side to side movement of their jaws.
I have NEVER seen a human being chew in a side to side motion like a cow or horse! The fact that our jaws have some horizontal flexibility is mostly useful for using the tongue to get food cleaned out from between the teeth and gums!
Omnivores have sharp claws, talons and beaks
Humans have Fingers, weak nails and lips
Ever had a run-in with an squirrel, mouse, or rabbit? They have VERY sharp claws! Granted, they don't have talons or beaks.... finches, however, have pretty strong beaks -- so does every bird that must crack open seeds.
Omnivores have pointed canine teeth for tearing and ripping with only slight ability to mash with the molars as seen in Dogs
Humans have flat, squared off teeth for chopping, grinding and mashing with only 2 canines
First of all, dogs are essentially omnivores. They need a balanced diet in much the same way humans do. Check the ingredients on your dog food cans and bags. And watch a dog around berries and fruits. We even have one that eats tomatoes off the vine!
In the meantime, humans have those two canines (which no horse or cow has....) and they are sufficient for what we need. Our front teeth bite pretty well, too -- not only apples, but pork chops.
Omnivores gulp their food in large chunks
Humans chew their food
We have a son with an open bite who is retarded. He gulps his food in large chunks and is quite healthy. In fact, a lot of kids have to be taught, and then constantly reminded, "please CHEW your food and don't gulp it!" In the meantime, some dogs and bears are very 'thoughtful' eaters, who seem to enjoy chewing their food. Ask to watch feeding time for the bears the next time you visit a zoo.
Omnivores have large mouth openings
Humans have comparatively small mouth openings
Care to take on a hippopotamus? Or a horse? Or a camel?
Omnivores have weak lips
Humans have strong lips which aid in food transmittal
There are a number of primates with very stong lips which are omnivores.
http://www.mc.maricopa.edu/~reffland/an ... vores.html
Noting that ALL primates have very strong lips, the following is interesting:
Primate
IV. Feeding Habits
The primate order includes a handful of species that live entirely on meat (carnivores) and also a few that are strict vegetarians (herbivores), but it is composed chiefly of animals that have varied diets (omnivores). The carnivorous primates are the four species of tarsiers, which live in Southeast Asia. Using their long back legs, these pocket-sized nocturnal hunters leap on their prey, pinning it down with their hands and then killing it with their needle-sharp teeth. Tarsiers primarily eat insects but will also eat lizards, bats, and snakes.
Other prosimians, such as galagos and mouse lemurs, also hunt for insects, but they supplement their diet with different kinds of food, including lizards, bird eggs, fruit, and plant sap. This opportunistic approach to feeding is seen in the majority of monkeys and also in chimpanzees. Several species of monkeys, and chimpanzees, but not the other apes, have been known to attack and eat other monkeys. Baboons, the most adept hunters on the ground, often eat meat and sometimes manage to kill small antelope.
Most apes and monkeys eat a range of plant-based foods, but a few specialize in eating leaves. South American howler monkeys and African colobus monkeys eat the leaves of many different trees, but the proboscis monkey on the island of Borneo is more selective, surviving largely on the leaves of mangroves. These leaf-eating monkeys have modified digestive systems, similar to cows, which enable them to break down food that few other monkeys can digest. Other apes and monkeys eat mostly fruit, while some marmosets and lemurs depend on tree gum and sap.
from http://encarta.msn.com/text_761569210___3/Primate.html