It all starts with the fact that thinking is expensive…
““It all starts with the fact that thinking is expensive from the standpoint of natural selection,” Mitchell continues. “The brain consumes 20 percent of the calories that humans eat. And while intelligence enabled humanity’s survival, our ancestors were in a constant race against starvation, too. So their brains only got so big.” Pugwash gets it. “Being smarter gets you more to eat but only up to a point,” he says. “Then there’s diminishing returns.” Mitchell nods. “And if human brains devoured double the calories, grandma and grandpa wouldn’t have found twice the nuts and berries. So our ancestors’ brains grew until they hit a certain equilibrium.” “Which means humans are a lot stupider than maybe they could be. Which explains Republicans.””
About This Quote
This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.
Intelligence is costly in energy, so evolution limited brain size, leading to diminishing returns on smarter bodies.
In simple terms: Big brains cost a lot of calories, so they stopped growing.
Key Takeaway
Recognize limits of natural selection on cognition.
Themes
evolution
energy
cognition
limitations
Mood
thoughtful
analytical
Type
scientific
philosophical
When to use this quote
- anthropology
- public policy
- education
- technology development
Key Concepts
metabolic cost
diminishing returns
brain size
natural selection
Questions to Reflect On
- How does energy cost shape intelligence?
- Can we overcome biological limits?
A Different Perspective
Human brains may be less optimal than possible, affecting societal outcomes.