Many people start their day with warm lemon water, believing it helps wake up the digestive system. Japanese Water Therapy takes an even simpler approach by emphasizing plain water before eating or drinking anything else.
Morning hydration is not unique to Japan. Similar practices also exist in traditional Ayurvedic medicine, where drinking water upon waking has long been encouraged as part of daily wellness routines.
What Is Japanese Water Therapy?
Japanese Water Therapy is often described online as a traditional Japanese wellness practice. Supporters claim it can help prevent or improve a wide variety of health conditions, including:
- Diabetes
- Gastritis
- Headaches
- Asthma and bronchitis
- Arthritis
- Epilepsy
- Heart disease
- Tuberculosis
- Constipation, diarrhea, and hemorrhoids
- Kidney and urinary disorders
- Eye, ear, nose, and throat conditions
- Menstrual and uterine disorders
- Cancer
However, there is no scientific evidence that drinking water alone can prevent or treat these diseases, especially serious illnesses such as cancer or tuberculosis.
How Is Japanese Water Therapy Practiced?
The traditional routine is simple:
1. Drink Water Immediately After Waking
Drink about 640 ml (approximately four 160 ml glasses) of water before eating or drinking anything else.
Supporters often recommend using slightly warm water rather than cold water.
2. Brush Your Teeth
After drinking the water, brush your teeth and clean your mouth.
3. Wait 45 Minutes
Avoid eating or drinking anything for the next 45 minutes.
4. Eat Breakfast
After the waiting period, eat your breakfast as usual.
5. Avoid Food and Drinks for Two Hours
Once breakfast is finished, avoid eating or drinking for approximately two hours.
How Long Should You Follow It?
Advocates o
- High blood pressure: 30 days
- Diabetes
- Gastritis: 10 days
- Constipation: 10 days
- Tuberculosis: 90 days
- Cancer: 180 days
For arthritis, some sources recommend starting with only three days during the first week before practicing daily.
If drinking 640 ml at once feels difficult, it is generally suggested to begin with a smaller amount and gradually increase it.
Does Scientific Research Support Japanese Water Therapy?
At present, no scientific studies support the specific health claims made about Japanese Water Therapy.
While staying well hydrated is unquestionably beneficial, there is no evidence that drinking water first thing in the morning can cure or prevent serious diseases.
Hydration supports normal body function, but illnesses such as cancer, tuberculosis, diabetes, and heart disease require evidence-based medical care.
Drinking water on an empty stomach may be a healthy habit, but it should never replace professional medical treatment.
A Similar Practice in India: Usha Paana Chikitsa
A comparable tradition exists in Ayurveda, known as Usha Paana Chikitsa, which translates to “early morning water therapy.”
Like Japanese Water Therapy, it recommends drinking water immediately after waking. However, the Ayurvedic practice typically suggests drinking approximately 1.5 liters of lukewarm or room-temperature water.
The practice generally includes:
- Drinking 1.5 liters of water immediately after waking
- Waiting before eating or drinking anything else
- Drinking the water slowly rather than all at once
Supporters believe this practice helps:
- Stimulate digestion
- Support hydration
- Promote regular bowel movements
- Prepare the digestive system for the day
However, these claims have not been confirmed by scientific research.
Does Science
Like Japanese Water Therapy, there is no scientific evidence showing that drinking such large amounts of water first thing in the morning provides unique health benefits beyond maintaining adequate hydration.
In fact, consuming excessive amounts of water quickly may pose health risks for some individuals, particularly those with kidney disease or electrolyte imbalances.
Can Drinking Too Much Water Be Harmful?
Although staying hydrated is essential, drinking excessive amounts of water in a short period can be dangerous.
1. The Kidneys Have Limits
Healthy kidneys can process only about 800–1,000 ml of water per hour. Drinking water faster than the kidneys can eliminate it may overwhelm the body’s ability to maintain fluid balance.
2. Hyponatremia (Water Intoxication)
Excessive water intake can lead to hyponatremia, a condition in which sodium levels in the blood become dangerously low.
Early symptoms may include:
- Headache
- Nausea
- Vomiting
- Confusion
- Fatigue
In severe cases, hyponatremia may cause:
- Seizures
- Eat
- Death
Although rare, water intoxication is a genuine medical emergency.
3. Early Symptoms Are Easy to Miss
Because early symptoms resemble those of many minor illnesses, water intoxication may not be recognized immediately. Prompt medical attention is important if symptoms appear after excessive water consumption.
4. Water Is Not a Cure-All
No amount of water can cure diseases such as:
- Arthritis
- Diabetes
- Cancer
- Heart disease
Hydration supports overall health, but it is not a substitute for medical treatment.
5. How Much Water Do You Really Need?
Hydration needs vary depending on:
- Age
- Body size
- Physical activity
- Climate
- Overall health
Rather than following a fixed rule, most healthy people can simply drink when they feel thirsty and maintain adequate fluid intake throughout the day.
The Bottom Line
Drinking water first thing in the morning is a simple habit that may help improve hydration and encourage healthy daily routines. However, there is no reliable scientific evidence that Japanese Water Therapy can cure or prevent serious illnesses.
Likewise, drinking extremely large amounts of water is not necessarily healthier and may even become dangerous if consumed too quickly.
The best approach is moderation:
- Stay hydrated throughout the day.
- Drink according to your body’s needs.
- Use water as part of a healthy lifestyle—not as a replacement for proven medical care.
Water is essential for good health, but it is not a miracle cure. Like many healthy habits, its greatest benefits come from consistency, balance, and realistic expectations.
