Protein, fat, cholesterol, methionine (a sulfur-containing amino acid), and dietary acids, which are all superabundant in animal foods, are poisoning nearly everyone following the standard Western diet. Most people cannot fathom this, because it takes four or more decades of consumption before disability, disfigurement, and death become common from these endogenous toxins. This long latent period fools the public into thinking there is no harm done by choosing an animal-food-based diet. If the case were one of instantaneous feedback—one plate of fried eggs caused excruciating chest pains, paralysis from a stroke followed a prime rib dinner, or a hard cancerous lump appeared within a week of a grilled cheese sandwich—then eating animal foods would be widely recognized as an exceedingly unwise choice.
More information: Five Major Poisons Inherently Found in Animal Foods