What makes the difference is the power of cilia which are the hair inside our body.
Cilia line the respiratory tract from the back of nose to bronchial tubes. The length is about 1/100 mm. Since cilia keep waving 15 times per second, even if you are infected by a virus, cilia deliver the virus to the back of throat and to the stomach very quickly, and the virus is killed by stomach acid.
But if the power of cilia is weakened, the virus doesn’t reach the stomach, stays in the air way, invades the body and causes inflammation, resulting in sneezing, runny nose, sore throat, cough, headache and/or fever.
What weakens the power of cilia?
The colder the temperature is, the slower the activity of cilia is. That means the function of cilia to deliver and discharge viruses becomes weaker.
Lack of water
In winter, water is lost from exhaled air and the skin because the air is dry.
In summer, when you sweat, you feel thirsty and drink water, but in winter, water is lost gradually without your notice and you don’t feel thirsty so much, so you don’t drink water.
Why does lack of water lower the activity of cilia?
Fig. 1 shows normal mucus and cilia and Fig. 2 shows decreased mucus and cilia.
When viruses come into your nose, cilia deliver the virus with mucus to your mouth or stomach, forming phlegm. But the lack of water decreases mucus and the viruses stay on the cilia without being delivered, and the viruses invade the cell and increase the number, resulting in catching a cold.
A virus which invaded the body in the morning becomes ten thousands in the evening (16 hours later) and becomes one million in the next morning (24 hours later), causing various cold symptoms.
So it is important to keep cilia active to prevent a virus from invading the body.
How can we hydrate the body efficiently not to catch a cold?
Even in winter, about 1.5 litter of water for a day is required. It is recommended to drink a glass of water 7-8 times throughout a day and you can protect your cilia from dehydration. It is not good to drink a lot of water at once because large amount of water is discharged as urine and doesn’t help hydration.
What beverage is good to drink for hydration?
Water or tea is good. Coffee and alcohol have a diuretic effect, so they are not good for hydration.
How to protect our body from viruses during sleep
While sleeping, we lose water from exhaled air and the skin, so during sleep, the activity of the cilia slows down and the possibility that we allow viruses to invade our body is higher.
The method which protects our body from viruses during sleep is inhaling the smell of mint.
Menthol contained in mint activates the function of cilia.
Mint towel: soak a towel in a bucket of water dropping 7-8 drops of mint oil and squeeze it lightly and hang the towel in your bed room. Menthol activates cilia and it moisturizes the room.
Mint mask: spray water in a spray bottle containing a drop of mint oil. Menthol activates cilia and prevents the mouth from drying.