The fresh air in the forest, with the aromatic smell of the plants in the forest, was washed by the water vapor of the waterfall, and then quietly entered the cave, and then was inhaled into the mouth by Wang Wuyun with a long breath, and entered Wang Wuyun's respiratory system.

A part of the air directly enters Wang Wuyun's lungs, and the oxygen in the air that enters the lungs is directly absorbed by the lungs, participates in the body's metabolism, and exchanges carbon dioxide, while a large part of the air inhaled by Wang Wuyun into the body unconsciously breaks through the bottleneck and limitations of ordinary people's breathing and directly enters Wang Wuyun's stomach and digestive system.

At this moment, Wang Wuyun's stomach and digestive system, although they look no different from normal people, are already very different from ordinary people at the microscopic level.

This microscopic level is the microflora.

In the digestive system of ordinary people, there are also a large number of microflora, these microflora microorganisms, such as bifidobacteria, lactobacilli, etc., can synthesize a variety of vitamins necessary for human growth and development, such as B vitamins, vitamin K, niacin, pantothenic acid, etc., and can also use protein residues to synthesize essential amino acids, such as aspartine, phenylalanine, valine and threonine, etc., and participate in the metabolism of sugars and proteins, absorb water, and promote iron, magnesium, The absorption of mineral elements such as zinc at the same time quickly eliminates harmful substances that enter the body.

The average human digestive system contains about 10 trillion beneficial microorganisms and bacteria, and these microorganisms, coexisting and co-prospering with people, are an indispensable part of human health and energy absorption.

In addition to these beneficial bacteria, there are many harmful and neutral bacteria in the intestinal tract of ordinary people.

Harmful microfloraAs the name suggests, once the number of these bacteria and microorganisms expands, it will affect the health of the person.

Neutrophils have two sides and are sometimes beneficial to the human body, such as Escherichia coli and enterococci, and once these flora proliferate out of control or move from the intestine to other places, it will cause many problems.

There are nearly 400 types of microflora in the intestinal tract of ordinary people.

As for cultivators, once they enter the Four-Story Building, which is the Edible Qi Realm, the number and variety of flora in the entire person's intestines will face earth-shaking changes, and these changes will reshape the ability of the entire person's digestive system.

Some beneficial bacteria and microorganisms that never appear in the intestines of ordinary people will begin to appear in the bodies of cultivators who have cultivated to enter the realm of eating qi, and the number can reach between 10 trillion and 30 trillion, and these newly emerged beneficial bacteria and microorganisms have an unimaginable effect for ordinary people.

It is impossible for ordinary people to breathe the air they inhale into their digestive system and intestines, but cultivators can easily do it, as simple as natural breathing.

The air that enters the digestive system and intestines, under the action of the beneficial bacteria that have newly appeared in the cultivator's body, is like entering a magical chemical factory, and begins to decompose, merge, and turn into all kinds of new substances.

The oxygen and hydrogen in the air are synthesized into moisture, which is directly absorbed by the body.

Nitrogen, oxygen, carbon dioxide and other gases in the air are collectively called proteins, amino acids and carbohydrates by those beneficial bacteria, providing various nutrients needed by the body's physical cells.

Rare gases such as neon, argon, krypton, xenon, and radon in the air will also be involved in the synthesis of substances of those new beneficial bacteria, and finally become some mysterious high-energy substances that only appear in the body of cultivators.

For example, helium, an inert gas hidden in the air, is a mysterious high-energy substance synthesized in the body of a cultivator in the Qi Eating Realm, which can make the true qi and blood in the cultivator's body run in the meridians and blood vessels in the body, producing a superfluid phenomenon similar to that when the cultivator needs it, the true qi of the whole body is almost unhindered when it runs in the body, and the speed can be dozens or hundreds of times faster than that of low-level cultivators, and the circulation of blood in the body is also smoother.

The mysterious high-energy substance synthesized by helium can even allow cultivators to obtain energy from the sun when they are basking in the sun, converting light energy into energy required by the human body, and completing a more complex and advanced energy conversion in the human body than the "helium knife fountain" test.

For a person, as long as the body is replenished with water, oxygen and nutrients, that person can survive in any environment.

This process is done silently in the human body, but it is extremely mysterious, and the impact is enormous.

For a cultivator, once he enters the food qi realm, it is equivalent to a car with a new engine, the original engine burns gasoline and needs to add gasoline to run, while the new engine, which does not burn gasoline, uses an infinite energy system, as long as there is air, it can run, and the engine power torque is greater and the response speed is faster.

The appearance of the infinite energy engine on the car is a revolutionary change, and for cultivators, crossing the cultivation threshold of the Food Qi Realm is also an important watershed in the cultivation process.

The Qi Eating Realm is the most important foundation for the path to the strong in cultivation, and it is also the watershed for beginner and intermediate cultivators.

The energy in the universe is indeed conserved and cannot be created in a vacuum.

A strong man who can fly away and break gold and stones, or even turn over rivers and seas, the energy source of his body can never be the most ordinary bread, potatoes, rice and beef, if the energy source of his body is really these, then, when such a strong man goes out, the most things he carries on his body must not be weapons and equipment, but his food, he has to eat the food he carries at any time, and his body can support such consumption.

The Qi Eating Realm, on the other hand, allows a cultivator to have a continuous source of energy, and as long as he breathes, he can obtain all the substances and nutrients that his body needs from the air.

Ordinary people's breath is breathing, but when a cultivator reaches the realm of eating qi, every breath he takes is giving his body tonic, and it is not a small tonic, but a big tonic.

People who enter the food qi realm can already gradually open the valley, and once they break through the food qi realm, people can completely get rid of the dependence on general food and have the ability to completely break the valley, of course, you can also eat, people in the food qi realm can really eat, because of the strong digestive system, the amount of food and the amount of food is completely beyond the imagination of ordinary people.

......

"To see if there is a foundation for cultivation on a planet, just look at the air composition on that planet, a planet that can give birth to powerful cultivators, in addition to oxygen, there must be hydrogen, nitrogen, carbon dioxide and neon, argon, krypton, xenon, Radon and other gases, and hydrogen in the universe is actually the most abundant, judging from your description, the earth must have had powerful cultivators visit a long, long time ago, so the composition of the air on the earth will be what you see, in this case, many of them are deliberately 'designed' and 'constructed' by powerful cultivators in the process of transforming the planet, and some special and precious plants can transform the air of a planet into something that meets the needs of cultivators......"

This is what Xue Qianyan said to Wang Wuyun before, as well as those cultivation secrets of the Food Qi Realm, which Xue Qianyan told Wang Wuyan.

After entering the Qi Eating Realm, in addition to his own strength having greatly improved, Wang Wuyun's understanding and experience of cultivation also entered another higher level.

At this moment, Wang Wuyun and Xue Qianyan were "retreating" in the cave behind the waterfall to cultivate.

Under the powerful effect of the Fire Spirit Ginseng, in just ten days, the two of them had already broken through to the tenth order of the Qi Eating Realm at the same time, and they were only one small step away from advancing to the Five-Fold Building Realm.

Because the speed of the two of them advancing was too fast, exceeding the expansion rate of the beneficial microorganisms in the six internal organs and the adaptation speed of the body, in Xue Qianyan's words, in this case, in order to avoid leaving sequelae and forge a solid foundation for cultivation, it was necessary to retreat and recuperate, let the body completely adapt to the state of the food qi realm, and then naturally complete the breakthrough of the tenth order and enter the five-story building.

As a result, the two of them, who had advanced to the tenth order of the Qi Eating Realm, had this retreat at the same time.

This retreat was the longest since Wang Wuyan's cultivation, and it had been a full twenty days, Wang Wuyun and Xue Qianyan had not eaten or drunk, not a drop of water, and no grains of rice, they were immersed in the state of eating qi realm, and all the energy in their bodies came from the air they breathed.

In this retreat, Wang Wuyun just breathed, but his body gradually had a feeling of being "full".

Finally, when his body reached the state of "fullest", Wang Wuyun seemed to hear the sound of broken eggshells in his internal organs, and a completely new power appeared in his body, and then the whole body vibrated with a hundred pulses, and he suddenly woke up from that state of retreat......

Wang Wuyin, who woke up, knew that his cultivation had passed the watershed of the food qi realm and entered the realm of the five weightless buildings.