Li Yu actually had problems with nutrition for a long time, and when the lizards first came out of the swamp, they all had some diseases on their bodies more or less.

When Li Yu saw a doctor for them, he found that many people's problems were actually caused by lack of nutrition.

Due to the scarcity of materials in the swamp and the difficulty of farming, the lizard people have a relatively simple source of food.

Some of them are short of breath, easily fatigued, often have headaches, and in severe cases, have difficulty walking, and even become dementia, which is caused by a lack of folic acid.

In contrast, people outside the swamp rarely have this problem, because foods containing folic acid are actually quite common outside.

Bread (or other whole grains), beans, broccoli...... These are foods that even civilians eat regularly.

In the same way, there is riboflavin, also known as vitamin B2, which is abundant in yeast, soybeans, and dairy products, and insufficient intake will cause angular cheilitis, glossitis, ocular conjunctivitis and so on...... Fortunately, in addition to these foods and some vegetables, riboflavin is also found in large quantities in animal liver, kidneys, hearts and poultry eggs.

The swamp can still be replenished.

Outside the swamps, undernutrition persists and is widespread.

After all, in the universe where Li Yu lives, vitamins were not discovered until the 19th century, and although some dietary guidelines have been issued before that, they are only empirical, and mixed with a lot of conjectures and fallacies.

There was a similar problem on the continent of Brattis, where the nobility and wealthy believed that wheat was the most nutritious, especially the finely sifted flour, and the more carefully sifted it was, the less impurities there were in the bread and the healthier it would be.

Small border nobles like the Arias family, who are not particularly particular, can knead and ferment the dough after sifting it once or twice, and Miss Rabbit with a little bran doesn't mind very much.

But for the real nobles in the royal capital, they had a special group of servants to do this kind of thing, which could be sifted seven or eight times, and exaggerated even a dozen times, and it is said that Count Rodrigo once held a banquet, and his cook sifted the flour used to make bread twenty-seven times.

The bread was as white as snow and had a soft texture, and even the emperor and empress were full of praise after eating it.

In addition to bread, all kinds of meat were also indispensable on the table of the aristocracy.

Not only domestic animals and poultry, but also game from the forest, roe deer, hares, antelopes, quails, even swans and herons...... They are all very popular, supplemented by a variety of precious spices, it is a delicacy.

However, the upper echelons of the empire were very reluctant to fruits and vegetables, especially fresh fruits and vegetables, presumably because they found it difficult to reassure people with unprocessed food, and it could not match their identity.

However, this inexplicable conceit can lead many of them to have loose teeth, curly hair, skin diseases, wounds that are difficult to heal, and even personality changes due to lack of subsistence.

On the contrary, because of what they have to eat, the commoners will go to the woods from time to time to dig up some wild vegetables and pick up some solitary seeds to feed their stomachs, and the recipe is more extensive than that of the nobles.

The main problems they face are too little meat intake, insufficient protein, and a lack of vitamin B12 and vitamin D, which can cause bleeding gums, yellowing of the eye skin, pernicious anemia, nausea, spinal pulp deformation, sentence disease, hypochondriasis and other symptoms. ….

Li Yu had seen many of these sick people during his wanderings around the village, some of whom were born unable to walk, and the priests of the Silvermoon Church called these deformed children abandoned by God, saying that they had been contaminated with filth since birth.

The mothers of those children also asked Li Yu for help, hoping that he could help her children to recover their health, but Li Yu did not have a good way to deal with the skeletal deformities caused by severe sentence dysphoria.

Modern medical care is not omnipotent, and Li Yu is not a professional doctor.

He is more from the perspective of prevention, as much as possible to reduce the probability of such things happening at the source.

Li Yu's plan was a two-pronged approach, preaching to believers on the importance of a balanced diet, and he even planned to add this part to the precepts in the future.

In addition, for the general protein deficiency of the common population, vitamin B12

In response to the problem of vitamin D deficiency, Li Yu's response is to develop aquaculture, more precisely, to dig ponds and prepare for fish farming.

The reason why fish farming, rather than pigs, cattle, and chickens, is because fish farming is the least costly.

If you want the majority of the people, not just a small part of the ruling class, to eat meat, you have to completely reduce the cost of meat production.

Speaking of which, this is the inspiration that Li Yu found from "History of the Crusades".

The first crusaders, also known as the Plebeian Crusaders, were basically a rabble, burning and looting all the way under the leadership of Peter the Monk, like a swarm of locusts, committing countless horrific atrocities, and finally being crushed by the Turkish army in 1096, almost completely annihilated.

But they were not without gain, and those who escaped by chance also brought back some carp along the way.

After that, the Europeans began to learn from their enemies and raise carp in large quantities.

This amazing fish actually came from a distant ancient country in the East, they are known for their tenacious vitality, fast reproduction, and rapid growth, and they don't even need to prepare special fish food, and they can grow well by feeding some leftovers.

It is an excellent source of meat, although there are a lot of spines, but this is not a problem for Li Yu, the only problem is how to find carp.

Li Yu did not find any trace of this fish when he was doing property research in the green field, and no one had even seen carp in the entire western region.

Therefore, the prophet of the Shuangxiu Sect could only entrust the Golden Fleece Chamber of Commerce to help him search for traces of carp on the continent of Brattis, as long as the live carp could be transported to the green field, Li Yu was willing to pay a high price of 3,000 gold coins to buy it.

Of course, Li Yu was not idle before the carp came, and planned to raise some pike first.

The ancient Romans used to breed pike as a source of meat, but with the collapse of the Roman Empire, the thriving fish farming industry disappeared, along with many other technologies.

Like carp, pike is also a relatively easy to raise fish in the water, with delicious meat and fast growth.

However, it is more ferocious than carp and pike, and in addition to attacking other fish, it also attacks small animals such as frogs, mallards, and rats, and if they lack food, they will kill each other.

The difficulty and cost of raising carp are higher than those of carp, but the advantage is that it is easy to get, and it is available in the nearby river, and it can be raised immediately.

You can do it as an over, but you can also accumulate some breeding experience.

In addition to digging fish ponds, Li Yu also plans to introduce tofu into Brattis as another means of supplementing protein.

Unlike carp, which you have to search for all over the world, tofu is easy to make, and the raw materials only need a variety of beans, gypsum, and a few simple steps to produce it, so that the beans that are not good taste can be delicious.

Derpy