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Should We Eat Meat?: Evolution and Consequences of Modern Carnivory

A data-rich case for a middle path on meat: why it shaped human evolution and still matters for nutrition, what industrial production costs the planet, and how much meat a sensible world could eat.

Table of Content

Most people who worry about meat swing between guilt and denial, and Vaclav Smil offers a better-informed position than either. In Should We Eat Meat?, the environmental scientist shows that meat helped build the human brain and still supplies protein, fat and iron more easily than plants do. Yet the scale at which we now raise animals is reshaping land, water and air.

His verdict lands somewhere between the two camps. Humans could live without meat, but they need not, and the wiser course is to produce and eat it rationally. The argument runs from group hunts for mammoths to refrigerated ships, and from chickens that reach full weight in six weeks to the 15,000 liters of hidden water behind a kilogram of beef. It ends with a realistic number for how much meat a sensible world might eat, plus the facts you need to judge your own plate against it.

Plants can feed a person well, so why do nutrition experts still treat meat as special? The answer involves energy, a mineral that up to 1.6 billion people are short of, and the growing brains of small children.

Bringing down a mammoth took more than spears. It took talk, trust and a plan. Smil traces how chasing big animals may have helped make us social, strategic and status-conscious.

A railroad patent and a ship sailing from Argentina did as much to change diets as any cookbook. Smil shows which inventions turned meat from a treat into an everyday expectation.

A modern broiler reaches its full weight in a fraction of the time its ancestors needed. That speed keeps prices low, but Smil shows what it does to the animals, the workers and the land.

The biggest footprint of a pork chop is not in the barn. Smil traces it back to soy fields, grazing land and a hidden flow of water that most shoppers never imagine.

Vegetarian diets, plant-based substitutes and meat grown in labs all promise a clean exit. Smil runs the numbers on each one, and the gap between the promise and the scale is wide.

Some countries eat more than 100 kilograms of meat per person every year. Smil proposes a far smaller figure, with Japan, the nation where life expectancy is highest, marking its upper end.

Smil’s question has a yes in it, but a conditional one. Meat helped make us who we are. It fed the brains that learned to speak and the bands of hunters that learned to plan, and it still delivers protein, fat and iron with less effort than any plant. What changed is the scale. Engines, fertilizer and refrigeration turned a prized meal into 55 billion chickens a year and a quarter of the world’s ice-free land given over to grazing.

His answer refuses both easy camps. Giving up meat entirely asks too much of culture and of children’s diets, and substitutes and lab meat remain too small or too distant. Eating as rich countries do now asks too much of soil, water and air.

That leaves choices a household can actually make. Let milk, eggs and farmed or freshwater fish carry part of your protein. When you do eat meat, lean toward chicken, given the gap between 2,000 and 15,000 liters of hidden water per kilogram. And measure your year against Smil’s range of 16 to 28 kilograms, instead of the hundred-plus some countries consume.

Japan, where people live longest, sits at the top of that range. Eating less meat, it turns out, has never required eating none.

About this book

What is this book about?

Arguments about meat tend to split into two camps: eat what you like, or give it up entirely. Vaclav Smil, a professor emeritus whose research spans energy, environment and food, takes neither side. He starts with biology and history. Meat supplied the protein, fat and iron that helped grow the human brain, and group hunting pushed early humans toward language and planning. Then he follows the modern turn. Refrigerated rail cars and ships, the combustion engine and synthetic fertilizer made meat cheap and plentiful. The result is an industrial chain that slaughtered 55 billion chickens in 2010 alone, uses a quarter of the Earth's ice-free land for grazing and needs about 15,000 liters of hidden water for every kilogram of beef. Smil also tests the popular exits, from vegetarianism to meat substitutes to lab-grown meat, and finds each one too small or too slow. His alternative is rational production. That means more dairy, eggs and farmed fish, a shift toward efficient animals like chickens, and a target between France's 16 and Japan's 28 kilograms per person a year. Readers get a clear frame for judging their own plate and the wider food debate.

Book Information

Rating:

Genre:

Health & Nutrition, Nature & the Environment

Topics:

Anthropology, Nutrition, Sustainability

Publisher:

Wiley

Language:

English

Narrator:

Emily

First published:

March 4, 2013

Pages:

288

Length:

15 min 23 sec

Get the book:

Amazon

Who it's for

  • Uneasy meat eaters

    Meat eaters who feel uneasy about the environmental cost but doubt that going vegan is the answer.

  • Parents weighing family nutrition

    Parents weighing protein and iron in a family's diet.

  • Wanting the hard numbers

    Students and professionals who want hard numbers on food, land, water and climate.

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About the Author

Vaclav Smil

Vaclav Smil is Distinguished Professor Emeritus in the Faculty of Environment at the University of Manitoba, where he has worked since 1972. Born in Plzeň in 1943, he holds a doctorate in geography from Pennsylvania State University. His research spans energy, environment, food, population, economics and history, including China's food and energy affairs. He has written more than 400 papers and 35 books, is a Fellow of the Royal Society of Canada, and was the first person from outside the US to receive the AAAS Award for Public Understanding of Science and Technology.

Ratings & Reviews

Ratings at a glance

3.3

Overall score based on 277 ratings.

What people think

Listeners find the work extensively researched and packed with detailed analysis, with one listener noting its thorough coverage of a complex subject. The quality of writing earns praise; one listener describes the author as a gifted writer. While listeners consider it an excellent book, they mention it is not an easy read.

Top reviews

Sophia

Smil is a gifted writer who manages to turn what could have been dry, boring data into a masterful study of human civilization. This is the most comprehensive look at carnivory I have ever encountered. He traces our history from prehistoric overkill to the modern efficiencies of poultry production. I was fascinated by the discussion on how meat contributed to the development of larger brains and social structures in early hominids. The truth is, the world isn't going to go vegan overnight, so Smil’s proposal for 'rational meat-eating' is the most pragmatic solution I've seen. He argues for reducing consumption and improving animal husbandry rather than outright abolition. If you want a book that respects your intelligence and provides a wealth of information, this is the one to get. Truly a brilliant piece of work.

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Bam

Wow, this book really challenged my assumptions about the future of global food security. Smil’s objective approach to such a passionate topic is refreshing. He makes a compelling case that while the current meat industry is full of malpractices, meat itself is not the enemy. He suggests that by focusing on animals like chickens or fish with better feed-conversion ratios, we can sustain a growing population without destroying the biosphere. The level of detail regarding the history of livestock in civilization is unparalleled. He doesn't shy away from the cruelty of modern farming, but he offers a rational path forward through better management and reduced waste. This is a must-read for anyone who wants to move past the 'meat is good vs. meat is bad' binary. It's a deep, rewarding dive into a truly global issue.

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Num

As someone who cares deeply about environmental impacts, I found this to be an incredibly well-researched and in-depth analysis of our meat-centric culture. Vaclav Smil provides a much-needed rational middle ground in a debate that is usually dominated by extreme rhetoric. He explores how humans and their livestock now totally dominate the biosphere, which is a staggering thought. The section on Concentrated Animal Feeding Operations (CAFOs) was particularly illuminating, detailing the industrial and globalized web that brings cheap meat to our tables. Personally, I appreciated that he doesn't just tell you what to think but presents the data on land use and emissions. It’s not an easy read by any means, but it is necessary for anyone who wants to understand the true cost of their dinner. It really makes you rethink the scale of modern production.

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Katya

Ever wonder why we chose cows and pigs for livestock instead of bears or other large mammals? Smil covers this in fascinating detail, explaining the history of domestication and the role of animals in human survival. He provides a sober accounting of the facts that is a welcome alternative to the polarized shouting matches we see online. I learned a lot about the energy cost of meat and how much by-product from other food processes can be used as animal feed. The book is very thorough, but be warned: you will need to exert a lot of attention to get through the sections on nitrogen cycles and carbon emissions. It’s a great resource for understanding the globalized manufacturing of food, even if the reference-heavy style is a bit exhausting. Definitely a solid addition to any environmentalist's library.

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Parichat

Picked this up because I wanted a deep dive into the numbers behind the meat industry, and Smil definitely delivered. This isn't an easy read; it requires the kind of focus you'd give to a graduate-level college course. The book is packed with facts about everything from prehistoric overkill to the modern manufacturing of pelleted feed. I found his discussion on the 'prehistoric overkill' hypothesis particularly illuminating. He manages to be neutral and objective in a field where that is almost impossible. While I didn't agree with every one of his conclusions regarding the health value of meat, I respected the sheer amount of work that went into this. It's an in-depth analysis that shows how livestock totally dominate the planet's biomass. If you can get past the dense writing style, there is a lot of gold in here for the patient reader.

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Gioia

Finally finished this after three separate attempts over the last year. My main takeaway is that Smil is undoubtedly smart, but the writing is quite a mess. He acknowledges that humans can live perfectly healthy lives without meat, yet he argues we should keep eating it because we simply like it too much to stop. It feels like a bit of a circular argument at times. The book is packed with enough footnotes to fill a second volume, which disrupts the flow of every single chapter. Frankly, if you just accept what he says uncritically, you’ll get the general gist, but you’ll miss the nuances regarding human health where he seems to ignore major studies like the China Study. It’s a decent data dump for your desk, but it’s definitely not a page-turner for the average person.

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Noo

Frankly, the information in this book is vital, but the delivery is a total mess. Smil is clearly an expert, but he writes like he’s trying to punish the reader with every sentence. It is just stats upon stats, making it a very slow read. One page he's talking about the biomass of wild land mammals, and the next he's diving into the obscure details of pig feed in the US versus Europe. I found the section on how humans and livestock dominate the planet to be the most valuable part. However, his dismissal of vegetable protein felt a bit dated and lacked the same level of rigorous scientific backing he gave to other topics. It’s a polarizing read. You’ll come away more informed, but you might have a headache from trying to untangle his prose. Proceed with caution.

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Wit

Not what I expected when I bought a book about the ethics of eating meat. I thought it would be a philosophical debate, but it’s actually a 200-page data dump. Smil is clearly a smart guy, and he’s done his research, but he’s not interested in making the reading experience enjoyable. He focuses heavily on the numbers—how many units of feed produce a unit of weight gain, the exact percentage of live weight that ends up as meat, and so on. Gotta say, it’s useful if you’re writing a thesis, but as a general reader, I struggled. He lands on a very middle-of-the-road perspective: eat less meat, but don't stop entirely. It feels like a very safe conclusion after so much technical build-up. It's an okay book, just very dry.

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Ratree

This felt more like wading through a complex spreadsheet than reading a cohesive book. While the author is clearly a distinguished professor with immense academic credibility, he tries to cram every single statistic he ever found on Wikipedia into these pages. The sentences are often broken and incredibly difficult to parse because of the dense reference style. To be fair, the research on feed conversion ratios—like the 7:1 ratio for cattle versus 1.1:1 for fish—is impressive and eye-opening. However, the sheer volume of data makes it a very hard read for anyone who isn't already a graduate-level researcher. I tried reading this twice and still felt like I was drowning in numbers. It is a thorough treatment of a complicated topic, but it lacks a compelling narrative to keep a casual reader engaged.

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Ingrid

The truth is that the logic in this book is completely circular and ultimately disappointing. Smil’s best rationale for why we should continue eating meat basically boils down to 'our ancestors did it.' He acknowledges the environmental devastation and the animal rights issues inherent in CAFOs, yet he still lands on a defense of moderate consumption. Why? Because humans are used to it. That isn't a scientific argument; it’s an ideological one. The book is a dense catalog of studies and citations that eventually feels like a middle schooler’s presentation trying to sound sophisticated. It’s Lowkey a very difficult read because of the sentence structure. If you are looking for a solid argument against veganism, you won't find it here—you'll just find a lot of numbers that don't actually justify the author's predetermined conclusions.

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Questions about this book

Smil argues that humans can live without meat but have no need to. Meat played a major part in human evolution and remains an easy source of high-quality protein, fat and iron. Modern industrial production, however, causes serious environmental and animal welfare problems. His answer is to keep eating meat but produce and consume it rationally: more efficiently, with less waste and in much smaller amounts in high-consuming countries.

No. He accepts that a vegetarian diet can be nutritious but says it takes more effort, especially to get enough iron and other metals, and particularly for young children. He also notes that no Western culture has more than four percent vegetarians or vegans. He expects that share could grow but never replace meat eating, so he looks for ways to reduce and improve meat production instead.

Most of the water behind meat is hidden in its feed, since a kilogram of feed needs about 1,000 liters or more, much of it lost to evaporation. Smil estimates about 2,000 liters of this virtual water per kilogram of optimally fed American chicken, about 5,000 for pork and about 15,000 for beef. That gap is one reason he favors more efficient animals such as chickens.

He suggests that rational production could provide anywhere from about 16 kilograms per person a year, which is the French level, up to 28 kilograms, the Japanese level, and Japan has the highest life expectancy of any country. That compares with a world average of around 40 kilograms and more than 100 in the United States, Spain and Brazil. Dairy, eggs, farmed or freshwater fish and substitutes like seitan can make up the difference.

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Should We Eat Meat?

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