This is the most common question asked of those individuals whose diet is whole-food plant-based.
Consider leafy plants. Some examples of (dry weight) caloric composition follows (from NutritionData.com):
kale: 16% protein; 12% fat; 72% carbohydrates
beet greens: 25 % protein; 5 % fat; 70% carbohydrates
spinach: 30% protein; 14% fat; 56% carbohydrates
compare this with:
bacon: 11% protein; 89% fat; 0 % carbohydrate
beef: 27% protein; 73% fat; 0 % carbohydrate
Big Mac: 18% protein; 52% fat; 30% carbohydrate
Example herbivore getting his protein:
EAT LIKE A PRIMATE!
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