Final answer:
Beef requires the greatest amount of land per calorie to produce.
Step-by-step explanation:
In the human diet, beef requires the greatest amount of land per calorie to produce. Beef production involves raising cattle, which require large areas of land for grazing and growing feed crops. This is because cattle need more food and water compared to other livestock animals, and a significant amount of land is needed to grow crops for their feed.
Learn more about Land requirement of different sources of calories in the human diet