All diet styles work. Forks, Paleo, Atkins, South Beach, Mediterranean,Grapefruit, Volumetrics, they all work. Some come with outrageous claims based on junk science, or simply blind faith. Trying to turn a species of omnivores into strictly herbivores, and then justifying it with with outrageous claims backed with no evidence, makes exactly as much sense as trying to turn your pet rabbit or guinea pig into a voracious carnivore - why would you do that?
Humans have been omnivores since prehistory. The most common human diet, and the one with the most science and generational observations to back it up, is a plant-based diet that also contains fish, poultry, and moderate amounts of red meat and dairy. Any diet that tells you to eat, say, meat exclusively, and no plants, or plants and no meat, are extreme deviations from the standard, and should be met with great skepticism, demanding extraordinary claims be supported with extraordinary evidence.
Oh, no, no! The best diet is a completely vegan diet – no animal products.
Actually, the best diet is the one that gives you the best variety of fats, proteins, and carbohydrates which enable you to perform your daily activities. Where you get those is up to you. Anything beyond that, which contains reasons beyond science, is either religion or justification.
Never eat anything with a face or a mother!
See? Religion. If you change "never" to "only" it sounds equally ridiculous.
I say eat what you want. Any diet that claims to cure a wide variety of degenerative diseases that aren't caused by food in the first place, is a diet to be viewed with great skepticism regarding its claims.