One reason for a vegetarian diet on Mars is solar efficiency: the sun is only 44% as strong, which makes raising meat less practical. Meat takes a lot of energ

One reason for a vegetarian diet on Mars is solar efficiency: the sun is only 44% as strong, which makes raising meat less practical. Meat takes a lot of energy, Another reason is the higher ambient radiation levels on Mars, which plants are more resilient to than animals. Animals would likely have a higher cancer rate than here on Earth, and who wants to eat a cancerous steak? Not appetizing.