This is a review of The Hungry Brain, by Stephan J. Guyenet, Ph. D. (sic).
The 300 odd page book is written for an audience that urgently seeks answers to an important question: what makes us overeat even though we want to be healthy?
Apparently many things, some that we can control, but (to my simple mind) many factors that cannot be controlled. Among the controllable factors are the immediate environment in which we work/live – most environments nudge you to overeat; another factor is the amount of exercise you put in, which trains the lipostat in your brain to set itself up for a lower adiposity level (ie., by exercising, you’re training your body to prefer to contain lesser fat). But among uncontrollable factors are the genes we’re born with, being on medication to treat life threatening diseases, and in my view, the food processing industry that is askew with a profiteering axis that makes (almost all) our food sugary, fattening and very tasty, all at the same time. (cue: workers of the world!)
Some of the chapters repeated what most of us already know. For a non-medico many others were a novelty. But the nuance of the novelty is not explained, leading to yours truly to be quite disappointed.
The written word is unfortunately sprinkled with compelling and vexing illustrations that boggle the mind with its pointlessness and blunt lack of creativity. For instance, there’s one illustration with a picture of the brain, and arrows that go in four directions, with the labels, up, down, left and (can you believe it?) right. The illustrations with pictures of the brain are presumably included to make the book seem like an intellectual work, but they should really be removed, simply to not reduce the credibility of the text.
From the book, a condensed brain-obesity relationship primer:
- Modernity makes us fat: technology, market forces, incurably sugar hungry brains (your brain loves cookies and cake; mine goes plain bonkers).
- Our evolution from hunters and gatherers to supermarket shoppers hasn’t helped. Some thousand years ago, humans ran after gazelles, and dug for tubers that they then didn’t really cook. Today, all I have to do is order food on Swiggy/Zomato/UberEats (and a poorly paid gentleman (only men so far) comes to my door with my box of food, ready for my gluttonous experience).
- Some of us have genes that are easily expressed for obesity. Especially so when our environments are so toxic.
- The ‘lipostat’ is stubborn. The lipostat is this system that responds to the hormone leptin that’s secreted by fat tissue. The objective of the system is to maintain homeostasis, specifically, the amount of adiposity in our bodies. Now the lipostat doesn’t care about our goals, it merely does what it must. And that’s why losing weight and staying that way is harder than we thought. The lazy lipostat adjusts itself to make us gain all that weight back. The good news, though, is that exercise inherently tunes the lipostat to a lower set point (is that good news?).
- Leptin, insulin, the hypothalamus: the three together are rascals. And circadian rhythm. These guys basically are very sensitive to external and internal cues. So, management of our circadian rhythm and the amount of insulin and leptin we allow our bodies to generate with the kind of food we consume greatly affects the hypothalamus, which then has a direct bearing on how much we eat (at each sitting or between). But managing them is no easy feat. It involves controlling the uncontrollable. What happens when an unstoppable force meets an immovable object, Bruce?
- Stress is bad. And knowing this is no help. Big nope.
- PS: special mention and thanks to all the mice that participated, surely involuntarily, in experiments that involved sawing their brains off, starving them, and sometimes feeding them pop tarts. Monkeys too. And people!
The book is a decent primer if one starts with a clean slate on obesity research. The easy penmanship is good for a quick read. But the easy content has sacrificed substance, in most cases. I, for one, would’ve liked knowing more about the lipostat, about how stress actually triggers harmful behaviour, etc. The footnotes were like french fries, really – all fluff and minimal satiety.
I’d be failing the book if I didn’t mention the mature writing style. Something that the writer deserves high praise for is that even though the book is on a topic that readers are seeking personal solutions to, the writing is only limited on the pontification scale. One might posit that it may have been tempting for a lesser writer to add a “tips that will change your life” postscript after every chapter. Thank you for not caving in, Stephan J. Guyenet, Ph.D. (sic).
I’d rate the book a 3/5. Read it if you enjoy learning about how the brain works, but don’t stop here! The right question is, is your time best utilised by reading The Hungry Brain, to learn about the brain-obesity relationship? Maybe so, if you have high reading speed and don’t mind being spoken to like a toddler sometimes.