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This Book May Save Your Life: Everyday Health Hacks to Worry Less and Live Better

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#1 SUNDAY TIMES BESTSELLER • A hilarious, myth-busting survival guide that explains the weird and wonderful bodily functions that keep us alive—and how to make them work better for longer—from TikTok's favorite doctor, “the go-to expert for a generation” (The Telegraph)

“Dr. Karan Rajan reveals his health hacks that may save your life. . . . In a world of charlatans and social media snake-oil salesmen, he provides a voice of reason.”—Mail on Sunday
 
Your body is incredible, but it’s also out to destroy you. Your brain is like an early computer operating system, riddled with bad code, slow to load, and more likely to watch cat memes than go to sleep. You’d be a mess without your skeleton, but it can be a bony cage if you’re tortured by backaches, niggling neck pain, and knee joints that crumble under pressure. And your nose is a design disaster, getting blocked, springing leaks, and growing random tufts of hair.

You are the sum total of a lot of mistakes, trials, and errors, and you have to learn to live with them as best you can. That’s where this book comes in. Here’s everything you need to know to slow the inevitable decay that’s plagued your body from the moment of your birth.
You

• Enjoy the most epic and efficient dump of your existence
• Optimize brain efficiency by putting an end to multitasking
• Give your breath a sniff test to assess your health
• Start treating your eye socket dumplings with the respect they deserve

Here’s how to keep all your organs living in peaceful harmony so that you can enjoy a better, longer, healthier life.

300 pages, Kindle Edition

Published January 9, 2024

726 people are currently reading
3091 people want to read

About the author

Karan Rajan

3 books32 followers

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Displaying 1 - 30 of 198 reviews
Profile Image for Laura.
806 reviews46 followers
January 6, 2024
Thank you NetGaley for providing a free Advanced Reader Copy in exchange for an honest review.

Informative and highly entertaining "This Book May Save Your Life" is a quick read for any busy inhabitant of the 21st century who would like to become more cognizant about how our body works. Dr. Rajan's sense of humor carries the book throughout the chapters with such ease, that you don't even realize how much you're learning. And "learning while having fun" is one of the best way to retain information in my opinion. The book is organized like a manual of anatomy, with each chapter covering one major system; exceptions are the chapters on the reproductive function and excretion (smooshed in one chapter), and the chapter on sleep (which I agree warranted its own chapter, although it may have followed more naturally after the nervous system, or vision). The book focuses on general, but well documented advice, so don't come looking for miracle smoothies and supplements here. The tried and true ways of prolonging your healthy life are explained against a background of how the different parts of our body work, and especially backfire. A bright light is shone on the shortcomings of this highly evolved human body.

At times this bright light and the humor poked at the failings of the body felt a bit too harsh, I will admit. The immune system isn't quite as faulty as the author makes it to be, nor is it quite as unfathomable either. The chapter on how our body protects itself was actually one of the weaker ones, and I suspect that was because it isn't Dr. Rajan's specialty. Another chapter where I believe more information was needed was the one dealing with the reproductive system. The role of the prostate was muddled and glossed over a lot: for e.g. the seminal fluid the prostate produces is absolutely necessary for sperm to survive, and the prostate location below the urinary bladder is, unlike the author's suggestion, not random; the prostate is meant to prevent leakage of the bladder contents during intercourse. The later-in-life urination problems that men face are irrelevant, considering most men reproduce and pass on their genes by the time that becomes of problem. Having worked on prostate cancer, I always find it a bit funny how few men understand the role of the prostate. The chapter on reproductions should have also discussed pregnancy more, a phenomenon that can after all affect half of the world's population. A few details on how to prepare for a healthy pregnancy, how to recognize potential signs of dangerous conditions like pre-eclampsia or liver toxicity, would have been helpful. But again, I guess this was far removed from Dr. Rajan's specialty (as evidence by the incorrect statement that human birth is dependent on medical assistance--just watch Dr. Danielle Jones for discussions on when birthing at home is and isn't advisable).

Overall though, I've had lots of fun reading this book, and as someone who majored in biology, I learned a lot. I had a hard time putting the book down, as the writing style is easy to follow (and like I mentioned, engaging). And the final chapter on death was a perfect way to end this book. A short discussion on donating organs, not just the body to science, is the only thing I believe it lacked. I highly recommend this brief journey through current anatomical knowledge to everyone over the age of 14. Lord knows the public education system fails many people in many countries. This book may just bridge the gap, for those in need of both basic, and more advanced information. Great debut of a great science communicator.
Profile Image for Laura.
1,019 reviews5 followers
March 9, 2024
I did not finish this one. I appreciate that Dr. Rajan is trying to make his information easier to understand, but his style just wasn't for me. I skipped around to read some bits and pieces that held more interest to me, but overall this was a miss.
Profile Image for Lilisa.
567 reviews86 followers
February 7, 2024
This is a must-read book about the human body and how it works. No part is off limits. Factual and humorous, this eye opening and easily digestible book about the inner workings of the body breaks down barriers that many avoid in conversations with family and friends. We are who we are, and the more we learn about what works and doesn’t work for our bodies, the better off we all are. Dr. Rajan lays it out for us, how our bodies function, how we can help ourselves by helping our bodies function better, and what we should avoid to keep our inner systems working smoothly. Who knew I’d learn a lot and thoroughly enjoy this “ode to our amazing bodies” as Dr. Rajan puts it. I highly recommend this book and recommend taking it a step further. Purchase copies for your family and friends. It will create a cascade effect where conversations about the human body are not to be shied away from but help us bust myths and make it easier to ask questions especially for those moving through their teens and early adulthood, and for that matter, everyone. Many thanks to the author, publisher, and NetGalley for the opportunity to read and review this book.
Profile Image for Marija.
60 reviews
June 9, 2024
I enjoy popular science books and I like the health-related videos the author makes. But I found the book to be far too metaphor-heavy, and the vast majority of facts seem like well-known things rather than peculiar quirks or lesser known facts about the human body
Profile Image for Sarah Stirrup.
102 reviews8 followers
January 7, 2024
Whilst I did enjoy the book, some parts took me longer to get through. Mainly the chapters on specialised parts of the body that Dr Karan didn’t have as much expertise into. Also, many of his paragraphs or segments read as if they were written for TikTok, at least a few of them I’ve definitely already seen it and could remember him posting - or at least he used the same phrasing and euphemisms for different body parts. I was also expecting it to have more autobiographical elements to it, as little of his personal life was mentioned. I think it’s because most books by surgeons do look back on cases they’ve studied and their lives as doctors and surgeons, but that’s Dr Karan’s choice at what he wants to include at the end of the day!
But still, a nice lighthearted book with plenty of fun facts and a lot of advice on how to stay healthy.
Profile Image for Dale B.
14 reviews
March 3, 2025
"Protect your head like you would your nether regions. After all you don't tolerate low- to moderate- grade impacts to your genitals every day"
Profile Image for Wendy.
136 reviews9 followers
November 6, 2023
If you love reading about interesting facts like I do, "This Book May Save Your Life" by Dr. Karan Rajan is a great read to pick up. The book is a fun, witty, and modern take on medical facts and helpful tips and tricks to get the most out of our bodies. Throughout the book, Rajan dives into the parts of our body that society thinks are taboo to talk about and shows it's not only acceptable to talk about them but to our benefit and could save our lives. By learning more about how our body works and why it does what it does, we get a true appreciation for all the amazing ways it keeps us alive. I often found myself relaying these fascinating facts to others while reading this book and looking up some of the obscure observations I had never heard of. What a fun read!

Thanks to NetGalley and Rodale Books for providing me with a copy of this fun book!
94 reviews
February 29, 2024
The title is misleading. The book explains how different systems of the body work but I really didn’t find much about how to live longer. There was almost nothing in the book that I found to be new information. The author did explain things well and in an interesting way and it might be a good read for a high school student or someone who doesn’t know much about the human body. There were several times where the author kind of contradicted himself; for instance saying that we get sick because we are too clean and wash our hands too much but we need to make sure to wash our hands and stay away from germs. Also, you should never hold your pee because it’s terrible for your bladder but you also shouldn’t go pee at every urge or your bladder capacity will decrease.
Profile Image for Pooja Dhami.
12 reviews81 followers
April 3, 2024
2.5 stars.

The title is entirely misleading. I'm just as prone to die as I was last Thursday.

I picked this book in the hopes of finding medical fun facts on the gastrointestinal and endocrine system given Dr. Rajan's day job as a surgeon. There were a few interesting tidbits but the forced humor was hard to digest.

For example, I learnt that humans are deuterostomes which implies that the developing fetus' first orifice to form is the anus, which is interesting. However, to repeatedly call readers 'assholes' and 'buttholes' is humour befitting 12-year-olds or the tiktokers who shot Dr Rajan to internet fame.
Profile Image for Roxana David.
Author 2 books4 followers
September 8, 2024
I was definitely NOT the target audience for this lol

I recommend it to kids, teenagers, people who have never studied biology/medicine or haven't paid much attention in school. It's very, very accessible (to a point where it's more fun than informative, at least for me) and full of puns and jokes (if you're into millennial 'dark' humor, which I'm certainly not).

It was painful to read at times and way too long. A concentrated edition of 30 pages would've been enough. However, I don't regret reading it, as some of the fun facts included here reignited my drive to discover more on the subject.
1 review
May 2, 2023
Great Book, very educational and light hearted. Would definitely recommend it!
Profile Image for Amy.
97 reviews
March 5, 2025
As a kid i always had a fascination with the human body and was always reading anatomy books, this one definitely did not fail me as an adult.
Not only was it educational but it was also humorous and light hearted. It kept the lightness going throughout with how easy it was to understand. But it was by no means dumbed down. Each subject was written in vivid detail, science/medical jargon was included, but then Dr Karan would explain it again in easier terms.
This book goes through each of the senses, the brain, the heart, the lungs, the sleep cycle, the immune system, sexual organs, the skin and the skeleton in vivid detail. Which sounds like a lot but this book was regular sized, and what i loved the most was that it didn’t drone on about one specific subject. It was very well paced and kept flowing through each subject nicely. It included historical examples when explaining how something was discovered or a patient who experienced something abnormal, which is something i normally don’t like as it seems to go on more than the subject, but this book did it the perfect amount, and he also picked very engaging examples.
I also liked how during each subject, the writing would get interrupted with health tips regarding the chapter subject. Ones i will be adhering to.
Overall, this book did not fail to fascinate me, learning about this has made me appreciate my body a lot more and notice more things i never would have before.
Profile Image for Dana M.
299 reviews14 followers
March 23, 2025
As a fan of Dr Rajan on social media and his podcast, getting his book was a no brainer.

This is a fantastic book, Dr Rajan uses humour and easy language to describe the human body in all its wonders and failings. The book is completely engaging and leaves nothing off the table (did you want to talk about poop? There’s a section about poop).

I really enjoyed how the book was organized, which each chapter being a major system (ie digestion), sense (ie sight), function (ie reproduction), or need (ie sleep). It was organized in a way that was enjoyable and kept me entertained.

As someone with an autoimmune disease, I found the chapter on how the human immune system can be faulty great! I have dealt with these faults for over a decade and it really sucks sometimes, or actually a lot of the time. It was great to hear someone tell me my feelings are valid and sometimes your body just doesn’t work the way it should.

Ending the book by talking about death seemed so fitting. What happens to your body, and what you can do with your body after death.

I highly recommend this book to anyone that wants to know more about how their body works, or even just wants some tips and tricks to live a little better.
Profile Image for Lauren.
553 reviews27 followers
January 16, 2024
Fascinating facts about bodies that range from fun to gross to terrifying. If you've spent any amount of time going on a WebMD spiral, it's likely you already know some of the content, but there were still some interesting things I learned, and even if I already knew something, it's always good to have health advice reinforced and reminders for why it's important to do things like stay hydrated and sleep well. I'll likely be incorporating some of Dr. Rajan's advice into my life going forward.

Disclaimer that I don't work in the medical field, so I can't comment on the accuracy of the information presented, but to me, Dr. Rajan's medical advice seemed solid and grounded in research.

3.5

Thanks to NetGalley for this ARC!
Profile Image for Zom Lee.
Author 5 books26 followers
January 22, 2024
This book may save your life was a fun and interesting read. I enjoyed the facts and anecdotes that the author discusses. Along with all the slang terms for various parts of the human anatomy. Overall, it's a fun book.
Profile Image for Rebecca Robinson.
149 reviews18 followers
February 6, 2024
Very fun to read, share, and learn from! I really enjoy his TikToks and his humor and educational tone shines in this book. Great for those wanting to learn more about the body and their own needs as a human meat suit.
Profile Image for Barış Kaplan.
111 reviews
May 23, 2025
Ölmeden önce okuması gereken sağlık kitaplarından biri, gerçekten bazı konularda hayatınızı değiştirecek bilgiler var. Bu bilgiler sadece bilimsel değil aynı zamanda psikolojik sağlığınız hakkında da. Çok hızlı akan, elinizden düşüremeyeceğiniz bir kitap... Keyifli okumalar.
Profile Image for Claire.
214 reviews1 follower
February 1, 2024
Very interesting and factual but I was hoping for a few more myths being explained as he does on tv and social media x
Profile Image for Zuster.
122 reviews1 follower
March 15, 2024
As a nurse i love these kinds of books. Still learn something new every time.
Profile Image for Jannie.
389 reviews3 followers
March 15, 2024
Interesting, informative, humorous at times, I think it’s a must read.
Profile Image for Hannah.
161 reviews2 followers
May 29, 2024
Some really great strategies and basic steps to taking care of your health. The thing I really took away from this is that the appendix is not a useless organ, but rather is the reason our gut flora gets restored.
Profile Image for Mohil Patel.
11 reviews
April 19, 2025
Save yourself is the premise of this book. It goes on somewhat detailed version of main body parts and its functions. It also provides some useful hints in each chapters.
Profile Image for Pamela Sue.
631 reviews4 followers
July 11, 2024
I don’t know how this book would save a life. Chapters gave a short summary of different body systems. It wasn’t new or very exciting information. Each chapter had a health hack but these didn’t even relate to the soft system being discussed. Wear sunscreen, drink water, wipe front to back. Not bad info but not new or life saving either.
Profile Image for Jonathan.
252 reviews9 followers
August 17, 2024
This Book May Save Your Life: Everyday Health Hacks to Worry Less and Live Better by Dr Karan Rajan offers a fresh, humorous take on health advice, much in the same style as his widely popular TikTok videos. If you’re a fan of his online content, you’ll find the same engaging tone and approachable language here, making it a book that can be read and understood by people of any age.

The book does a commendable job of debunking myths about the human body and offering practical advice on living better. From quirky health hacks to common misconceptions, Dr Rajan provides a wealth of information that’s both useful and easy to digest. He aims to make health accessible and relatable, stripping away the jargon and presenting facts educationally and entertainingly.

While I walked away with plenty of valuable insights, This Book May Save Your Life didn’t quite hit the mark regarding originality or depth. For readers familiar with Dr Rajan’s TikTok content, much of the book may feel like a rehash of what you’ve already seen. While effective in small doses, the humour sometimes feels a bit too familiar, lacking the freshness that made his videos so famous in the first place.

For these reasons, I’m giving This Book May Save Your Life a respectable 3 out of 5 stars. It’s a handy resource with plenty of good advice, but it may not offer much new for those already acquainted with Dr Rajan’s work. If you’re new to his content or looking for a light-hearted approach to health, this book might be just what you’re looking for.
Profile Image for Marie.
1,810 reviews16 followers
March 19, 2024
Every 2 minutes look away from a screen and focus on an object that is 20 feet away for at least 20 seconds. This allows your eyes to relax and momentarily turn your focus off.

Use over the ear headphones to limit your direct exposure to higher sounds to your inner ear.

Multitasking erodes your productivity and task efficiency. It results in increased error rate and higher levels of inaccuracies. MRI's have demonstrate that multitasking results in reduced density of the anterior cingulate cortex which is the area of the brain involved in empathy and emotional regulation.

Learning a new skill or doing things a different way will extend the warranty on your cognitive function.

Our bodies have a shelf life. Choose whether to embrace with with honesty and ultimately make peace with the inevitable.
Profile Image for Jo Morrison.
268 reviews2 followers
March 17, 2024
A great listen on audible. The author is dynamic and engaging and funny. He’s also fab on TikTok! Basically he takes you in a guided tour of how your body works with little tips and tricks to keep you healthy. No fads or nonsense, just sensible advice from a doctor. Enjoyed.
Profile Image for Satid.
170 reviews
April 17, 2025
Since I read these books: Doctor Sarah Holper: What's Wrong With You?: An Insider's Guide To Your Insides and James Hamblin:If Our Bodies Could Talk: A Guide to Operating and Maintaining a Human Body before this one, I learn not much new health education as all these books have a lot in common in their contents. But judging by itself, this book contains good bits of useful health knowledge and practices. It also helps confirm what I read in Dr. Holper's book. For any one who already read Dr. Holper's or Hamblin's book, this one adds just only a little more health knowledge.

What the author writes in this book is mostly standard personal health knowledge that is widely written in such popular science books on health. Readers can find some fanciful tidbits that may not be practically useful but serve as wide-eye condiment here and there. So, most information in this book is practically useful and should be widely practised. The strange but perhaps natural point when it comes to human health welfare is that there are a sizeable groups of people worldwide who hold contrary views (as opposed to provable knowledge) such as those antivac, antievolution and such. A few of these groups even publish pop science books to promulgate their views. Luckily, such books were not widely read, so far!

I only hope that medical doctors would write more about their professional experiences than these "standard" health topics because there are already too many books of such type. It would be more beneficial for medical doctors to write books like these ones: Hot Lights, Cold Steel: Life, Death and Sleepless Nights in a Surgeon's First Years, Every Patient Tells a Story: Medical Mysteries and the Art of Diagnosis, Complications: A Surgeon's Notes on an Imperfect Science (actually all books by Doctor Atul Gawande), Fragile Lives: A Heart Surgeon’s Stories of Life and Death on the Operating Table, books by Dr. Henry Marsh and the like. These type of memoir books are more enriching and interesting to read from real lives of medical doctors.
Displaying 1 - 30 of 198 reviews

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