'#3 Major Don'ts': 21 Doctors Reveal Dangerous Habits That Shorten Lifespan… Book Release on June 16 Based on Viral Post Read 120 Million Times!

Takahashi Shoten Co., Ltd. (Headquarters: Toshima-ku, Tokyo; President: Yoshinari Mishina) released

'#3 Major Don'ts' (General Supervisor: Daichi Kurihara) nationwide at bookstores and online retailers on Tuesday, June 16, 2026.

This book is a collection of advice in which 21 doctors collectively identify three key habits each across various medical specialties that 'should be avoided' and 'should be adopted.'

Rather than complex medical knowledge, it clearly explains dangerous habits people often unknowingly engage in daily life, as well as simple, actionable behaviors that help maintain health.

What is '#3 Major Don'ts'?

'#3 Major Don'ts' originated as a keyword from a post made in August 2025 by Dr. Daichi Kurihara, an ophthalmologist and author of this book (X account name: Doctor K @ Eye Doctor Dad), on the social media platform X. The valuable information shared by a medical professional inspired readers to 'share this with someone,' resulting in 120 million impressions and 49,000 likes.

This book expands upon that viral post, transforming it into a comprehensive publication across multiple medical fields.

We conducted a survey among 21 doctors asking for their personal 'Top 3 Don'ts,' and after reviewing supporting academic papers, only those with solid scientific evidence were included.

This ensures the book is medically reliable.

Examples of '#3 Major Don'ts'

・Bench pressing (Orthopedic Surgery)

・Zero-calorie beverages (Endocrinology and Metabolism)

・Blue-light blocking glasses for children (Ophthalmology)

Clear and Concise Format

The book presents the message 'these are the things you must stop doing' in a simple, memorable format of three items per topic. The following page clearly explains the medical reasoning behind each.

Additionally, each medical specialty section includes information about the contributing doctor, allowing readers to check their social media accounts or affiliated medical institutions.

【Table of Contents】

Introduction

Chapter 1: Internal Medicine & Gastroenterology's 3 Major Don'ts

Pulmonology's 3 Major Don'ts / Cardiology's 3 Major Don'ts, etc.

Column: Why Has '#3 Major Don'ts' Gained Such Support?

Chapter 2: Pediatrics & Obstetrics/Gynecology's 3 Major Don'ts

Pediatrics' 3 Major Don'ts / Obstetrics & Gynecology's 3 Major Don'ts

Scenario-Based 'Don'ts & Dos' List ①: Parenting Edition

Chapter 3: Surgery's 3 Major Don'ts

Plastic Surgery's 3 Major Don'ts / Orthopedic Surgery's 3 Major Don'ts, etc.

Special Dialogue ①: Stop Taking This Information at Face Value

Chapter 4: Ophthalmology, ENT, and Dentistry's 3 Major Don'ts

Ophthalmology's 3 Major Don'ts / ENT's 3 Major Don'ts, etc.

Scenario-Based 'Don'ts & Dos' List ②: Diet Edition

Chapter 5: Sleep and Mental Health's 3 Major Don'ts

Geriatrics' 3 Major Don'ts / Sleep Specialist's 3 Major Don'ts, etc.

Special Dialogue ②: Why Can't We Stop Even When Told To?

Chapter 6: Medication's 3 Major Don'ts

Pharmacy Professor's 3 Major Don'ts / General Practice's 3 Major Don'ts

Scenario-Based 'Don'ts & Dos' List ③: Work & Exercise Edition

Scenario-Based 'Don'ts & Dos' List ④: Relaxation & Self-Care Edition

References

Conclusion

General Supervisor: Daichi Kurihara

Certified Ophthalmologist by the Japanese Ophthalmological Society.
While working as an ophthalmologist at a general hospital in the Kanto region, he also serves as Editor-in-Chief and Medical Writer for the web media 'Online Eye Clinic,' having authored over 500 articles.
He publishes daily articles on eye health and ophthalmology. His X account (Doctor K @ Eye Doctor Dad) has over 62,000 followers. His previous book is 'Latest Knowledge from an Ophthalmologist: Eye Care in the Smartphone Era' (Takahashi Shoten).

【Publication Details】

'#3 Major Don'ts'

Price: ¥1,320 (tax included) | 176 pages | 46-size format | ISBN 978-4-471-03205-0