Answer:
By eating things with protein in it. Sorry if this sounds too simple, but that's all it is.
It is strengthened by data which is always contradictory.
The epiglottis is a flap in the back of your tongue that prevents food from entering the larynx. When your mouth is closed, the epiglottis is in place and blocks the larynx opening. If your mouth is open, the flap lifts and the larynx is no longer blocked so you can breathe. This is why it's important to not chew with your mouth open... if you do, then food can go down the larynx by mistake.
Any place where there are living organisms
Lack of exercise
High blood pressure
Diabetes
Obesity and high cholesterol
