Many believe that drinking water without brushing your teeth will swallow the bacteria in your mouth into your stomach, which is more harmful than skipping breakfast. This statement seems reasonable, but it is actually not supported by scientific evidence.

There are indeed many bacteria in the oral cavity, but when drinking water, they usually do not enter the stomach. Even if some harmful bacteria flow into the stomach, the gastric acid secreted by the stomach can kill them in time and eliminate them through metabolism without causing harm to the gastrointestinal tract.

On the contrary, there are many benefits to drinking water in the morning. Firstly, after a night of sleep without any intake of fluids, our body loses water through sweating and breathing. At this time, blood becomes thicker. Replenishing water can dilute blood and reduce the risk of blood clots and other cardiovascular diseases such as coronary heart disease.

Secondly, it can reduce the risk of urinary system infections. During sleep, urine is produced but not excreted easily leading to concentration and deposition of crystals. Drinking a glass of water in the morning can dilute urine and accelerate its flow rate to prevent bacterial growth and reproduction in urethra and bladder.

In addition，drinking water in the morning also promotes intestinal health. Adequate intake of water helps soften stools，prevent constipation problems，maintain normal peristalsis of intestines，and maintain good operation of digestive system.

Compared with drinking water on an empty stomach，multiple studies have proven that skipping breakfast has greater risks.The American Heart Association published a study showing that skipping breakfast increases risks such as obesity,hypertension,type 2 diabetes ,metabolic syndrome,and heart disease.It also increases cholesterol or fat content levels among others factors increasing serious cardiovascular disease-related deaths.

On February 23rd ,2023,researchers from Mount Sinai Icahn School Of Medicine And Harvard Medical School published a study in the journal "Cell" showing that skipping breakfast may cause damage to the immune system, thereby affecting the body's ability to resist infections and possibly increasing the risk of heart disease.

Therefore, for our health, it is not only important to drink water in the morning but also have a good breakfast.

As the largest metabolic factory in our body，the kidneys excrete excess water daily and maintain water, electrolyte and acid-base balance within our bodies.

However，if we consume more water than what our kidneys can handle，the excess water will stay in blood vessels diluting sodium concentration which creates an osmotic gradient between intracellular and extracellular spaces leading to cellular swelling causing hyponatremia or water intoxication.

Mild cases of hyponatremia can cause dizziness,sleepiness,and confusion while severe cases can lead to death.Therefore,it is important not to drink excessive amounts of water at once.

On the other hand，compared with people who drink plenty of water ,there are more people who wait until they feel thirsty before drinking. In fact, this thirst is no longer just a feeling but a warning sign from your body indicating mild dehydration.

Insufficient water intake can cause dehydration in cells and tissues, leading to symptoms such as thirst, dry skin, and decreased urine output. If this persists for a long time, it may also affect kidney function and increase the risk of urinary tract infections and kidney stone formation.

Severe dehydration can make the blood viscous, affecting blood circulation and causing insufficient oxygen supply to the brain. This can result in symptoms such as increased heart rate, low blood pressure, fatigue, and dizziness.

Therefore, drinking water may seem like a simple matter but there are several points that need attention. So how do we drink water in a healthy way?

The first glass of water in the morning is very important as it not only maintains our body's health but also fills us with energy and vitality.

Drink three types of water in the morning:

1. Warm or room temperature plain water

Currently, the best choice for replenishing fluids is warm or room temperature plain water (10~40℃). It not only quickly replenishes fluids but also promotes absorption of essential minerals needed by the body to maintain normal metabolism.

2. Low-fat or skim milk or unsweetened soy-based drinks

During breakfast time, students and elderly individuals can choose milk or soy-based drinks. Milk and soy-based drinks are rich in protein, calcium, vitamins, and other nutrients that promote bone growth and prevent osteoporosis. They also aid digestion and maintain intestinal health.

3. Unsweetened tea or coffee

For office workers who want some variety during their mornings: moderate consumption of unsweetened tea or coffee is recommended because tea contains abundant flavonoids which have antioxidant effects while improving vascular dilation; coffee helps reduce the incidence of type II diabetes while providing certain protection for cardiovascular health.

However,

both these "waters" contain caffeine which stimulates brain activity; therefore,

to ensure good sleep quality,

it is not recommended to consume them in the evening,

and it is best to limit daily intake to no more than 300ml.