Must a sapient species be a true omnivore to exist?

My father (who is a biologist) thinks that a sapient species must be a true omnivore because if it were an obligate herbivore (like a koala or a sloth), it would not have enough nutrients to develop a big brain and if it were an obligate carnivore (like an axolotl or a penguin), it would not have enough carbohydrates to turn into electricity.

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Must a sapient species be a true omnivore to exist?

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