All we have to do to figure out what we should eat is look at our own bodies. We have no fangs and no claws. If we did not have tools like knives, guns and facilities like slaughterhouses we could not kill and dismember animals or shred their flesh. We have no physiological features that indicate we should be eating animals.
Our intestines are long, unlike those of true carnivores or omnivores. Our saliva's pH is suited to digesting plants, not animals. Our gut microbiome requires fiber, which is only found in plants, to function properly.
Exogenous cholesterol, which we ingest if we eat animals, but which is not present in plants, causes our arteries to clog, leading to heart disease, strokes and diabetes. Herbivores, including humans, create all the cholesterol we need - there is no need to get it from any other source and doing so actually causes disease. Cholesterol is an exceptionally important substance. We need it to carry out numerous functions including vital hormonal functions, but we make all we need internally. And more is not better, as millions of cases of deadly atherosclerosis have shown. True carnivores and omnivores must get their cholesterol from killing and eating other animals.
We humans do not internally produce the vitamin C that carnivores do. Since we do not produce it, we must get it from our diet. Animal foods do not contain vitamin C. Only plants do. We need to eat plants.
Since carnivores produce all the vitamin C they need to be healthy, there is no need for them to eat plants.
Our eyes have evolved to see colors more readily than movement - the brilliant, beautiful colors of fruits and vegetables are alluring to us. The eyes of carnivores more readily see movement which evokes a predatory chase response in them.
Our tongues are smooth, unlike those of true meat-eaters, since rough tongues assist in shredding flesh. We have no use for such a feature since we are designed to eat plants.
Humans, like other herbivores, cool ourselves by sweating through pores in our skin all over our bodies. Carnivores and omnivores pant only from their mouths.
Our jaws have the capacity to move side to side, which enables us to grind grains and other fibrous plants. Carni/omnivore jaws only snap open and closed - they do not so much chew their food as rip and swallow it whole.
Some say the presence of canine teeth in humans proves we are supposed to eat animals. This is untrue. Read here about canine teeth and herbivores.
Across the world, vegans who eat a healthy whole food plant-based diet are more likely to be of normal healthy weight, and have significantly lower risk of common diseases like heart attacks, strokes, cancers and diabetes than people who eat animals.
For more in-depth discussion of physiology and diet read these articles:
The Evolution Of A Vegan
The Physiology Of A Vegan
Beyond The Paleolithic Diet
Naturally Vegan - How Evolution Shaped Us
We know that humans can and do thrive on whole food plant-based diets. So why continue to eat a diet of animals which makes us sick? And on their behalf, why continue to abuse/farm animals and take their lives when we do not have to?
Eating plant-based also creates the least environmental impact on our beleaguered planet, so again, why continue to create human disease, and support animal cruelty and planetary abuse when we do not have to? Eat plants.
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