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Are humans carnivores herbivores or omnivores?

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it depends on what you eat. most humans eat both plants and meat, so therefor we are omnivores
Many people believe that humans are omnivores. Omnivores (omni = all) eat meat as well as plants; carnivores (carni = meat) eat only meat, and herbivores (herbi = plants) eat only plants.

That's not to say that human beings can't survive perfectly well on a herbivorous diet with no meat. But most people live as omnivores. Humans (like other herbivores) cannot digest cellulose, so they depend on microbes in their digestive tracts to do so. Humans can synthesize all the amino acids they need, except for essential amino acids, which they are able to obtain in abundance from plants.

Summary of Dr. Milton Mills' The Comparative Anatomy of Eating:
:
Facial Muscles
Carnivore: Reduced to allow wide mouth gape
Herbivore: Well-developed
Omnivore: Reduced
Human: Well-developed


Jaw Type
Carnivore: Angle not expanded
Herbivore: Expanded angle
Omnivore: Angle not expanded
Human: Expanded angle


Jaw Joint Location
Carnivore: On same plane as molar teeth
Herbivore: Above the plane of the molars
Omnivore: On same plane as molar teeth
Human: Above the plane of the molars


Jaw Motion
Carnivore: Shearing; minimal side-to-side motion
Herbivore: No shear; good side-to-side, front-to-back
Omnivore: Shearing; minimal side-to-side
Human: No shear; good side-to-side, front-to-back


Major Jaw Muscles
Carnivore: Temporalis
Herbivore: Masseter and pterygoids
Omnivore: Temporalis
Human: Masseter and pterygoids


Mouth Opening vs. Head Size
Carnivore: Large
Herbivore: Small
Omnivore: Large
Human: Small


Teeth (Incisors)
Carnivore: Short and pointed
Herbivore: Broad, flattened and spade shaped
Omnivore: Short and pointed
Human: Broad, flattened and spade shaped


Teeth (Canines)
Carnivore: Long, sharp and curved
Herbivore: Dull and short or long (for defense), or none
Omnivore: Long, sharp and curved
Human: Short and blunted


Teeth (Molars)
Carnivore: Sharp, jagged and blade shaped
Herbivore: Flattened with cusps vs complex surface
Omnivore: Sharp blades and/or flattened
Human: Flattened with nodular cusps


Chewing
Carnivore: None; swallows food whole
Herbivore: Extensive chewing necessary
Omnivore: Swallows food whole and/or simple crushing
Human: Extensive chewing necessary


Saliva
Carnivore: No digestive enzymes
Herbivore: Carbohydrate digesting enzymes
Omnivore: No digestive enzymes
Human: Carbohydrate digesting enzymes


Stomach
Carnivore: Simple
Herbivore: Simple or multiple chambers
Omnivore: Simple
Human: Simple


Stomach Acidity
Carnivore: Less than or equal to pH 1 with food in stomach
Herbivore: pH 4 to 5 with food in stomach
Omnivore: Less than or equal to pH 1 with food in stomach
Human: pH 4 to 5 with food in stomach


Stomach Capacity
Carnivore: 60% to 70% of total volume of digestive tract
Herbivore: Less than 30% of total volume of digestive tract
Omnivore: 60% to 70% of total volume of digestive tract
Human: 21% to 27% of total volume of digestive tract


Length of Small Intestine
Carnivore: 3 to 6 times body length
Herbivore: 10 to more than 12 times body length
Omnivore: 4 to 6 times body length
Human: 10 to 11 times body length


Colon
Carnivore: Simple, short and smooth
Herbivore: Long, complex; may be sacculated
Omnivore: Simple, short and smooth
Human: Long, sacculated


Liver
Carnivore: Can detoxify vitamin A
Herbivore: Cannot detoxify vitamin A
Omnivore: Can detoxify vitamin A
Human: Cannot detoxify vitamin A


Kidneys
Carnivore: Extremely concentrated urine
Herbivore: Moderately concentrated urine
Omnivore: Extremely concentrated urine
Human: Moderately concentrated urine


Nails
Carnivore: Sharp claws
Herbivore: Flattened nails or blunt hooves
Omnivore: Sharp claws
Human: Flattened nails
Humans are omnivores.
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