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I like meat but they're more correct than most of the replies.
Going up the food chain results in most of the energy getting used lower on the food chain, and it is about a 10:1 ratio.
So, yes, if you feed an animal something that could have been eaten by people (like food-grade corn), then you will result in substantially lower amounts of final food-grade calories than you started with. The overwhelming majority of the energy gets used up in digestion and the life processes of the animal, not stored as meat.
Which is why the morons saying "duh, clearly 16 kg of grain becomes 16 kg of beef" are missing the point and wrong.
That said, yes, the points saying "but what if we feed them non-human food like grass" are absolutely correct. This is exactly why humans would, for instance, graze sheep and cattle on land that wasn't fit for agriculture.
The overall point is that from an energy / calorie standpoint, it is in fact inefficient to grow corn to feed to animals to eat.
Now, we have many luxuries in modern life. Driving across country to visit family when that used to be a trip people might do once in their life to seek better opportunities is not energy efficient but that doesn't mean it's wrong.
So just because feeding a cow corn is energy inefficient compared to just eating the corn doesn't mean it's necessarily an incorrect choice. Energy efficiency isn't everything.
But most of these comments demonstrate a basic ignorance of energy balance in the food chain.
Additionally, beyond taste, this is why we (generally) eat herbivores rather than carnivores, because it's far more efficient to stop at the first reasonable point of consumption rather than continuing to have the 90% loss going up the food chain.
Meat has a lot of advantages as a food, in taste and nutrient value. But carnivore meat doesn't have any significant advantage over herbivore meat, so we seek to get the most efficient meat we can.
Additionally, chicken is generally more efficient than beef. Again, efficiency isn't everything, but this is a factor in why chicken tends to be cheaper than beef.
I disagree with vegans overall, but their math is closer to correct than most of this thread, which is fully of people who clearly don't understand the point being made and think they're brilliant while showing off their ignorance.