Tight underwear & pants

Sperm production is extremely sensitive to temperature, and requires temperatures a few degrees lower than the temperature inside the abdomen. The tight underwear likely to push the testes closer to the abdomen and raise the temperature inside the scrotum. Please avoid tight underwear or pants, particularly during sports activities. Wear loose clothing, especially if you sit for long periods of time.

2. Hot sauna or hot bath

Exposure to high temperatures, like in hot tubs, hot baths or saunas for 30 minutes can cause the temperature of the testes to become too hot. This can kill sperm and lower sperm count. Avoid sitting on a hot chair.

3. Put laptops on their laps

Males who use laptops on their laps are likely to experience scrotal hyperthermia – elevated temperatures in their testicles – which can significantly affect the quality of their sperm, and consequently their fertility.

4. Sexual inactivity

If the inactivity period is too long, sperm motility tends to decrease and sperm DNA damage rates tend to increase.

5. Sitting long hours

Avoid sitting for long hours, which worsen testicular blood flow. Please get off the chair once in 1-2 hours while you are working, and stretch yourself on the floor or shake your whole body.

6. Lack of sleep

Sleep at least 6 hours and more.

7. Lack of nutrition

Healthy eating habit is crucial to fertility.

8. Too much alcohol/caffeine intake

Try decaffeinate coffee, Japanese tea or herb tea,etc.

9. Stress

To avoid stressing out, we recommend Gentle breathing exercise: Such as Yoga, Qi gong, and Tai Qi.

10. Hair restorer

Do not use finasteride (Propecia, Proscar) for hair loss. There is accumulating evidence that it negatively impacts male fertility.

References (Japanese sites):

https://ivf-kyono.com/column/post-700/

https://sset-clinic.com/guide/seisi_huyasu/index.html

http://www.ishikawa-hp.or.jp/medical/medical12.html

https://www.elevit.jp/ninkatsu-m/nutrition/foodlist/#:~:text=いくことです。-,亜鉛をしっかり摂取できる食材,には注意しましょう。