【Are you sure about that?】 Deciphering health, food safety, and environmental issues through eggs

A unique column that takes a slightly different perspective to delve into the eggs we eat every day.

↑ I also write articles independently in English.
If you would prefer not to read articles automatically translated by AI, I apologize for the inconvenience, but please read the article via this link.

Why are there so many types of eggs, yet only a handful are truly good?

I always have mixed feelings when I look at supermarkets or online shops.

Even though the sales floor is large and there are so many on display...
there are very few eggs that I actually want to buy.

I think the tendency to prioritize price is strong because it's something we eat every day, but I believe that precisely because we eat them every day, there is a problem.
So, this time, I would like to write about my own thoughts on eggs.

I realize there may be parts that are hard to relate to, but I would appreciate it if you could take your time to read through it when you have a moment.

Eggs where the rearing environment is invisible are ordinary eggs

If you look at an egg package and nothing is written about the rearing method, it is an ordinary egg.

Ordinary eggs are generally eggs produced in the following environment.

• Windowless poultry houses

• Caged rearing where space is narrow and it is difficult to move freely

• An environment with poor ventilation where disease is likely to occur without medication

They cannot engage in behaviors such as sunbathing, dust bathing, foraging, mating, or moving to places for laying eggs or sleeping.

Because of this, they suffer from a lack of exercise, making it difficult to build up physical strength and resistance to disease, and stress also accumulates.
Chickens continue to lay eggs in a cramped space without being able to engage in their natural behaviors.

While there is the advantage of being less affected by the external environment and being able to produce efficiently, it is far from natural.

Even if the price is low, when I think about the chickens, I don't feel like buying them.

The importance of the place of origin

Even if you have an image of "eggs born in a land rich in nature," if it is just a regular egg with nothing more specified, it simply means that there is a poultry farm in that location.

It does not necessarily mean that the eggs were laid by chickens raised free-range in that land.

On the other hand, in the case of cage-free or free-range farming where they can walk around, the quality of the external environment becomes important.

Since an environment with clean air, few natural predators, and comfort is necessary, it is better to check the place of origin carefully.

Don't be misled by appearance or nutritional fortification

Appearance

• Differences in color such as white, pink, or red

• Differences in the intensity of the yolk color

• The degree of yolk firmness

• Differences in viscosity and elasticity

• Differences in shell hardness

• Differences in size

• Differences in shape

and so on.
There are many things, but personally, I think you don't need to worry about them that much unless you want to prioritize appearance or need to calculate precise amounts.

Nutritional fortification

• Folic acid fortification

• Vitamin A fortification

• Vitamin E fortification

• Vitamin D fortified

• Alpha-linolenic acid fortified

• Taurine enriched

• Lutein enriched

• Astaxanthin added

• Lowers neutral fat

• Low cholesterol

and so on.
Chickens that lay nutritionally fortified eggs tend to eat a lot of feed they wouldn't normally eat, which is a bit far from nature.

It looks attractive as a product, but...

I think it is more important whether the parent chickens are healthy and laying eggs in a way that is close to nature, rather than feeding them specific feed to increase visible numbers.

Also, as can be said at any time,food is about balance.

Rather than eating several types of nutritionally fortified foods, it is less burdensome and healthier for the body to eat a variety of natural, seasonal ingredients in a balanced way.

Food is very complex, and multiple nutrients are intertwined to become one.

It is easy for specific nutrients to become a hot topic as being good for the body, but if you focus only on them, it will conversely become a burden on the body. By taking them in a balanced way with other nutrients, you can expect increased absorption rates, the offsetting of disadvantages, and synergistic effects.

Nutritional functional foods are made for people who are deficient in specific nutrients, but it is not something that can be solved so easily. It is better to think of them as things to eat only when it is truly difficult to solve the problem otherwise.

I think the act of fortifying specific nutrients itself is not that important.

More than half of brand eggs are image strategy

To differentiate themselves from other products, each producer is making every possible effort.

• Differentiation of taste

• Differentiation in nutrition

• Differentiation in origin

• Differentiation in feed

• Differentiation in freshness

• Differentiation in appearance

• Differentiation in size

• Differentiation in eco-friendliness

and so on.
Using nutritional fortification to create a difference, as mentioned earlier, is also a form of brand strategy. Product differentiation begins with areas where costs can be kept low.

Even with small differences, companies build a unique image and brand through packaging and advertising that catch the consumer's eye.

However, the more advertising is done, the higher the advertising costs become, which means less money can be spent on the actual product. The more common a product is, the more likely it is to be a case of 'selling dog meat under the guise of a sheep's head,' so we as consumers must not simply buy things because they are famous, but rather check the product details thoroughly before purchasing.

The safety of feed is often opaque

Corn, soybean meal, rice, acetic acid, mugwort, seaweed, chlorella, oyster shells, bamboo powder, mulberry leaves, paprika, tree sap (wood vinegar), minerals, marigold, oligosaccharides, lactic acid bacteria, natural water, and so on.

Just from a quick search, there are this many.

However, even if the types are listed, it is rarely specified to what extent that feed considers safety or the environment.

• Is it grown using pesticides?

• Is it made with genetically modified organisms?

• Is it produced in land with little marine pollution?

• Is it produced in land with little soil contamination?

• Does it contain ingredients that promote deforestation?

And so on.
I believe that what is truly important is not the content, but safety and environmental consideration.

What chickens eat eventually becomes soil and returns to nature.

If the feed is not carefully considered, it will place a burden on the environment during the production process, and also on our bodies when we eat the chicken or eggs.

Also, the large amount of chicken manure produced by poultry farms is processed and sold.
Vegetables are grown from that soil again, and the cycle continues.

This is not limited to chicken or eggs, but many things happen simultaneously until food is produced, and that accumulation also affects the environment.

At the very least, cage-free eggs

I think many people feel they cannot afford to buy things that are particular about feed, but since there is a wide variety of cage-free eggs available recently, they are easier to purchase.
Previously, there were only regular eggs, but the market is definitely changing.

↓ I would like to summarize some of them below.
Please note that eggs that are excessively fortified with nutrients or eggs whose yolk color is far from natural are excluded.

↑ Currently, it is in a red package.
The explanatory text has also changed.

Amatake: Nanbu-dori Eggs that are delicious raw

【Origin】 Iwate Prefecture

【Rearing Method】

• Windowless poultry house

• Nipple watering system

• Raised without the use of antibiotics or synthetic antibacterial agents throughout the entire rearing period

• Developed a program to control constant temperature and humidity using floor heating, etc.

• Energy reuse for heating, etc., using a chicken manure boiler

【Feed】

Original feed containing shiitake mushrooms, rice malt, natto bacteria, herb extracts, lactic acid bacteria, yeast, polyphenols, oligosaccharides, astaxanthin, carotene-containing Japanese and Chinese herbs, and ancient marine minerals produced from strata hundreds of years old

【Company Website】

Sakuragawa City, Ibaraki Prefecture - Pasture-raised eggs

[Origin]

Agri-Techno Sakuragawa Farm Co., Ltd. (Ibaraki Prefecture)

[Rearing Method]

• Semi-windowless poultry house with light and ventilation

• Multi-tier pasture-raised poultry house (Aviary system)

[Feed]

The main ingredients, corn and soybean meal, are non-genetically modified (NON-GMO)

[Product Page]

LIFE NATURAL Gentle Pasture-Raised Eggs

[Origin]

Agri-Techno Sakuragawa Farm Co., Ltd. (Ibaraki Prefecture)

[Rearing Method]

• Semi-windowless poultry house with light and ventilation

• Multi-tier pasture-raised poultry house (Aviary system)

[Feed]

The main ingredients, corn and soybean meal, are non-genetically modified (NON-GMO)

[Product Page]

https://www.jz-tamago.co.jp/life/hiragai/

*Except for the package design and product page, these are the same free-range eggs from Sakuragawa City, Ibaraki Prefecture, sold at Coop Deli.

↓ Here are a few other free-range eggs.

Free-range Sesame Eggs

[Origin]

Mt. Bear Co., Ltd. (Okayama Prefecture)

[Rearing Method] [Feed] [Product Page]

Cannot be confirmed at this time as the website is inaccessible

Hiragai Ippin (Free-range Masterpiece)

[Origin]

Sorting and Packaging Facility: Tamago & Farmers Co., Ltd. Ishioka Packing Plant

[Rearing Method]

Multi-tier free-range poultry house (Aviary system)

[Feed] [Product Page]

Unknown

Topvalu Free-range Eggs

[Origin]

Hokuryo Co., Ltd. (Miyagi Prefecture)

[Rearing Method]

Multi-tier cage-free housing (Aviary system)

[Feed]

Unknown

[Product Page]
Topvalu cage-free eggs come in three ranks, and this is the lowest-ranked egg.
Details are introduced on the site below. ↓

PHF Cage-Free Eggs

[Origin]

Arum Co., Ltd. (Okayama Prefecture)

[Rearing Method]

Open-style chicken coop with natural light

[Feed]

Corn is post-harvest free
Corn and soybean meal are identity preserved to prevent the inclusion of genetically modified organisms

[Company Page]

That is all. These were cage-free eggs.
Currently, there are products that are also particular about the presence or absence of medication and the safety of the feed. Please be sure to check the packaging or website when purchasing.

↓ I also looked into organic eggs, which are even more carefully produced.

Highly safe eggs with a very low environmental impact

Kurofuji Farm Real Organic Eggs (Organic JAS certified)

【Origin】

1,100m above sea level in the mountains of Kai City, Yamanashi Prefecture
An environment that is very cool and comfortable even in summer

【Rearing Method】
Free-range grazing
Strict standards for everything the chickens eat, drink, and where they live

【Feed】
No feed using genetically modified seeds is used for the main ingredients, corn and soybean meal
Fermented feed uses okara (soy pulp) and rice bran as main ingredients. Other ingredients include natural spring water, seaweed powder, sea lettuce, fish meal, oyster shells, bamboo powder, garlic, and oligosaccharides

【Product Page】

Co-op Deli Special Feature Page

Recently, it has become easier to purchase organic eggs on the internet as well.

The following are some examples.
(I plan to update this list as needed if better options become available)

■ Ten-R Co., Ltd.

■ Kajiwara Farm Co., Ltd.

■ Farm Agricola

Farm Agricola's organic eggs can also be purchased at Green Beans below.
https://greenbeans.com/products/14549414668688/details

The market and the environment will certainly change depending on what you choose

What kind of eggs do you usually buy?

The number of free-range egg products is steadily increasing to meet consumer needs, which was not the case before.

Although eggs are currently expensive and hard to buy, I believe that a day will come when they become easier to purchase thanks to advancements in feed production technology and poultry management systems.

Regarding the current situation and the issues at hand, I am sure there are pros and cons, but I would be happy if this serves as a starting point for thought or if it conveys something to you, even if just a little.

Are you always able to make your ideal boiled egg?
↓ If you want to know more about eggs, please be sure to read this article as well.

About updates

(I will notify you if there are major changes.)

2021.9.28
Added images of real organic eggs

2025.11.25
Migrated the article from Mutenka Club to note and updated the entire content

2025.12.23
Added Hiragai Ippin (free-range specialty eggs)

2026.5.1
Added PHF free-range eggs

Last updated: 2026.5.15

I will continue to update this article.

I don't think reading it once is the end, so I would be happy if you could refer to this article whenever you have the opportunity.

Thank you for your continued support.

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