[Over 250,000 Subscribers] Popular YouTuber Doctor Reveals What He Doesn't Eat and What He Does for Health!

Gakken Holdings Co., Ltd. (Tokyo, Shinagawa/Representative Director and President: Hiroaki Miyahara)'s group company, Gakken Co., Ltd. (Tokyo, Shinagawa/Representative Director and President: Tatsuya Nanjo), released "Things You Shouldn't Eat x Good Things: Food Can Solve Your Body's Ailments" on Friday, May 1, 2026.

▼ "Things You Shouldn't Eat x Good Things: Food Can Solve Your Body's Ailments"
https://www.amazon.co.jp/dp/4058027185/

What does a doctor not eat and what does he eat for health?

For those concerned about lifestyle diseases and health, Dr. Tetsuya Iseru, an influencer doctor with over 252,000 YouTube channel subscribers (as of April 2026), openly introduces foods he avoids and foods he actively consumes!

In recent years, with the Westernization of eating habits, it is common to consume many high-calorie, high-fat, high-salt, and high-sugar foods. This book clearly explains foods to avoid and recommended foods for individual symptoms and purposes, such as those concerned about their health check-up numbers or those with physical ailments, based on evidence from "clinical guidelines" set by medical societies. It also carefully introduces coping strategies for when you absolutely want to eat foods that should be avoided for health reasons.

■ Popular YouTuber Doctor x Registered Dietitian Form a Powerful Tag Team!

Nutrition supervision for this book is provided by Ms. Ayako Sekiguchi, a registered dietitian with over 683,000 YouTube channel subscribers (as of April 2026). This is a must-read book from the powerful tag team of a popular YouTuber doctor and a registered dietitian.

*As of April 2026

【Main Contents】

＜Chapter 1＞
If you're concerned about your "health check-up results"
Don't eat this, eat this

1. Kidney function, difficult to recover if function declines
- If you're concerned about kidney function, stop eating this
- If you're concerned about kidney function, eat this
- Check symptoms that require attention for kidney function

2. Blood sugar, an indicator for early detection of diabetes
- If you're concerned about blood sugar, stop eating this
- If you're concerned about blood sugar, eat this
- Check symptoms that require attention for blood sugar

3. Cholesterol, the #1 item easily caught in health check-ups
- If you're concerned about cholesterol, stop eating this
- If you're concerned about cholesterol, eat this
- Check symptoms that require attention for cholesterol

4. High blood pressure, a national disease affecting 1 in 2 people over 50
- If you're concerned about blood pressure, stop eating this
- If you're concerned about blood pressure, eat this
- Check symptoms that require attention for high blood pressure

5. Liver function, a top item easily caught in health check-ups
- If you're concerned about liver function, stop eating this
- If you're concerned about liver function, eat this
- Check symptoms that require attention for liver function

＜Chapter 2＞
If you're concerned about "vague ailments"
Don't eat this, eat this

1. Stomach upset/discomfort
- If your stomach is bothering you, stop eating this
- If your stomach is bothering you, eat this
- Check symptoms that require attention for your stomach

2. Rumbling stomach/constipation
- If your intestines are bothering you, stop eating this
- If your intestines are bothering you, eat this
- Check symptoms that require attention for your intestines

3. Frequent urination/residual urine sensation
- If you have urinary problems, stop eating this
- If you have urinary problems, eat this
- Check symptoms that require attention for urination

4. "Heavy" fatigue
- If you're concerned about fatigue, stop eating this
- If you're concerned about fatigue, eat this
- Check symptoms that require attention for fatigue

5. Dry/tired eyes
- If your eyes are bothering you, stop eating this
- If your eyes are bothering you, eat this

6. Unstoppable irritability, inner restlessness
- If you're worried it might be menopause, stop eating this
- If you're worried it might be menopause, eat this
- Also recommended for women
- Also recommended for men

＜Chapter 3＞
In the era of 100-year lifespans, aiming for "active seniors"
Don't eat this, eat this

1. Spots, wrinkles, dullness
- If you're concerned about "looking old," stop eating this
- If you're concerned about "looking old," eat this

2. Hair loss, thinning hair
- If you're concerned about your hair, stop eating this
- If you're concerned about your hair, eat this

3. "Accidental forgetting"/cognitive function
- If you're concerned about brain aging, stop eating this
- If you're concerned about brain aging, eat this

4. Neck, shoulder, back, knee pain
- If joint pain is tough, stop eating this
- If joint pain is tough, eat this

5. Muscle weakness, physical decline
- If you're worried about frailty, stop eating this
- If you're worried about frailty, eat this
- If you have a small appetite, eat this

6. Cancer, which affects approximately 1 in 2 Japanese people
- If you want to keep cancer away, stop eating this
- If you want to keep cancer away, eat this