Man, you just don't get it do you?
First, and foremost, he is stating that Cancer is caused by a lack of oxygen caused by acidity in the body at a particular location, or throughout the body.
He's simply stating that by alkalizing the body, or increasing oxygen levels, the body has a better opportunity to heal itself. Cancer is nothing more than a scavenger looking to clean up sick and dead cells.
I submit that cancer absolutely cannot harm healthy cells. No disease can attack healthy cells, they are impervious to disease. Now, if we create the conditions in our body's that deprive the body of required nutrients and oxygen, we end up with sick, dying and dead cells, which are prone to diseases such as cancer.
Dr. Caldwell is absolutely right by stating that by alkalyzing the body, those cancer cells would have no victims (sick, dying, dead cells) to scavenge.
Meat does not alkalize the body, meat is a hard to digest toxin, that draws calcium from your bones (to nullify the affects of its toxcity), while sitting in your intestines (colon) for days, years, and even a lifetime digesting.
Meat protein actually feeds cancer cells, as proven in laboratory mice. It was discovered that increasing meat proteins in mice induces cancer, and reducing said protein, diminishes cancer (watch Forks over Knives).
If you ate nothing but meat you would die, if you ate nothing but plants, you would thrive.
Contrary to popular belief, humans are not carnivores...we have way more in common with herbavores. If you don't believe me....jump on the back of a full grown cow and bite down on its neck, and see how far you get (heck, you couldn't harm a calf).
Undigestable (or hard to digest foods) are enveloped by mucous, which creates acidity in the body. This mucous can be located in most people's bodies who eat the SAD diet (standard american diet) from their esophagus to their colons. Mucous in the body represents an area of depletion, and most of us are victims of it, as a result of our diets.
We eat meat (full of pesticides, fecal matter, cleansed in ammonia, irradiated, diseased, soy and corn fed, etc.), pasteurized milks and cheeses, processed foods (guaranteed GMO food sources), sugary baked goods, artificial ingrediets, food dyes (carcinogenic), conventionally grown fruits and veggies (pesticide hazzard), fluoridated water, we apply heavily chemicaled lotions, deodorants (anti-persperants), soaps, submit to vaccinations, over the counter and prescription drugs, and are exposed to a host of other environmental advesities (cell phones, pollution, wireless radiation, etc.), etc.
It comes down to an undenaible physics, if you partake in the world's food supply, it will keep you sick, fat, dumb, and ultimately dead, while you fatten the pokets of big pharma, Monsanto, and everone else who has a stake in your bad health.