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Nori and Proteins: Why This Seaweed with 40% Protein Surpasses Beef

Nori and Proteins: Why This Seaweed with 40% Protein Surpasses Beef

- Categories : Wellbeing advices Rss feed

Nori contains between 30% and 50% protein by its dry weight, with an average of 40%. It is twice as much as raw beef, which peaks between 17 and 23% depending on the cuts (Fleurence). and others., 2012). And that's not all: this red algae offers a complete profile of essential amino acids comparable to that of an egg, the global reference for protein quality (Peñalver and others., 2020). Here is a piece of information that deserves serious attention.

Honestly, when I discovered these figures several years ago, I initially thought it was a mistake. We have been working with algae since 2007 at Biovie, and yet this nutritional reality remains largely unknown to the general public. Nori, that thin sheet that wraps your makis, is not just an edible packaging. It is a true concentrate of nutrients that our Japanese ancestors have been consuming for over a thousand years, and recent scientific studies finally allow us to understand why.

In this article, I invite you to explore together what makes nori an exceptional plant-based alternative to meat, supported by scientific data. No miracle promises, just verifiable facts and practical advice for incorporating this seaweed into your diet.

Summary

Nori: Champion of Plant-Based Proteins

40% protein: the figure that changes everything

Let's start with the raw numbers. The nutritional analyses of dried nori (Porphyra sp.) reveal a protein content ranging from 30 to 50% of dry weight, with an average around 40% according to the USDA database and the work of Fleurence and collaborators published in Trends in Food Science & Technology I'm sorry, but it seems like the text you provided is incomplete. Could you please provide more context or complete the sentence so I can assist you better? and others., 2012).

To put this in perspective:

  • Raw beef : 17 to 23% protein depending on the cuts
  • The chicken : approximately 20-25%
  • The salmon : 20-22%
  • Nori : 30-50%, average 40%

Specifically, if you compare 100 grams of dried nori to 100 grams of steak, the seaweed contains approximately twice as much protein. Obviously, one does not eat 100 grams of nori at once (that would be equivalent to 30 to 40 sheets!), but this exceptional concentration allows for a significant protein intake with small quantities.

A study published in the Journal of Applied Phycology confirmed that seaweeds, and particularly the Porphyra (which includes nori), have the highest protein content in the plant kingdom, just behind microalgae like spirulina (Holdt & Kraan, 2011).

A complete protein with all essential amino acids

But quantity isn't everything. What truly distinguishes nori is the quality of its proteins.

Our body needs 9 so-called "essential" amino acids that it cannot produce on its own: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. And nori contains them all.

Research published in Marine Drugs have demonstrated that the amino acid profile of nori shows a remarkably balanced composition. Essential amino acids account for 40 to 50% of the total amino acids, which is comparable to reference proteins like egg or milk (Peñalver and others., 2020).

Certainly, lysine remains slightly limiting in nori, as in most plant proteins. However, a varied diet very easily compensates for this slight imbalance. If you consume legumes, grains, or even a few eggs during the week, you have nothing to worry about.

The Nori that we offer at Biovie is dried at less than 45°C, which helps preserve the integrity of these amino acids. Because yes, drying at high temperatures would denature some of these valuable nutrients.

Nori et protéines

Nori vs beef: detailed nutritional comparison

Comparison of proteins and nutrients

Here is a factual comparison between 100g of dried nori and 100g of raw beef (USDA and CIQUAL data, compiled by MacArtain). and others., 2007):

For the proteins:

  • Dried nori: 30-50g (average 40g)
  • Raw beef: 17-23g (average 20g)
  • Nori advantage: approximately 2x more protein

For iron:

  • Dried nori: 10-15 mg
  • Raw beef: 2-3 mg
  • Nori advantage: approximately 5x more iron

For vitamin B12:

  • Dried nori: 30-60 µg
  • Raw beef: 2-3 µg
  • Nori advantage: approximately 20x more B12

For the fibers:

  • Dried nori: 25-35g
  • Raw beef: 0g
  • Nori advantage: exclusive presence

For saturated fats:

  • Dried nori: <1g
  • Raw beef: 5-15g
  • Nori advantage: near absence

The amino acid profile: as complete as the egg

The quality of a protein is measured by its PDCAAS score (Protein Digestibility-Corrected Amino Acid Score) or more recently by the DIAAS score (Digestible Indispensable Amino Acid ScoreThese indices assess both the amino acid composition and their digestibility.

Research published in Food Chemistry have demonstrated that algae of the genus Porphyra present a Protein digestibility greater than 80%, which is remarkable for a plant source (Wong & Cheung, 2000).

In reality, the protein profile of nori is closer to that of an egg than that of legumes. This is information that often surprises, but the scientific data is clear.

The low-temperature drying we practice at Biovie (below 45°C) helps maintain this optimal digestibility. Industrial high-temperature drying would not only degrade heat-sensitive amino acids but also reduce the overall bioavailability of proteins.

Beyond Proteins: The Nutritional Bonuses of Nori

Vitamin B12: The Vegan Advantage

Here is a topic that particularly interests vegans and vegetarians. Vitamin B12 is almost exclusively found in animal products... except in certain algae, including nori.

A major study published in Nutrients demonstrated that dried nori contains significant amounts of Vitamin B12 in bioactive form (cobalamin). The analyses reveal an average content of 30 to 60 µg per 100g of dried nori, which is well above the recommended daily intake of 2.4 µg for an adult (Watanabe). and others., 2014).

However, caution is advised: the bioavailability of this B12 is still a subject of debate within the scientific community. Some studies suggest that a portion might be in the form of inactive analogs. However, Watanabe's research has shown that the B12 in nori Porphyra is predominantly in active form and effectively helps improve the B12 status of deficient individuals (Watanabe and others., 2014).

Frankly, even though nori cannot completely replace supplementation for strict vegans, it makes a valuable contribution to the daily intake of B12. It is one of the few plant sources that can claim this benefit.

Omega-3, iron, iodine: a nutrient concentrate

Nori is not limited to proteins and B12. This seaweed offers an impressive range of nutrients:

Omega-3 EPA : Unlike most plants that only contain ALA-type omega-3s (which our body converts very poorly into EPA and DHA), nori directly containsEPA (eicosapentaenoic acid). It is exceptional in the plant world. Research published in Food Chemistry quantified the presence of EPA in the algae Porphyra I'm sorry, but it seems like the text you provided is incomplete. Could you please provide more context or complete the sentence so I can assist you better? and others., 2010).

Iron : With 10 to 15 mg per 100g, nori is an excellent source of iron. Admittedly, it is non-heme iron (less well absorbed than the iron from meat), but the simultaneous presence of vitamin C in the seaweed promotes its absorption (MacArtain). and others., 2007).

Iodine : It is often the primary concern regarding seaweed. Good news: nori is the seaweed with the most moderate iodine content, with about 16 to 20 µg per gram according to ANSES. This is much less than kombu (1500+ µg/g) or wakame (100-300 µg/g). Regular but reasonable consumption of nori (a few sheets per week) poses no problem for the thyroid of healthy individuals.

Our fresh nori BRETALG, resulting from our exclusive partnership with Breton producers, particularly preserves these nutrients well thanks to optimal harvesting and conservation.

The environmental impact: 50 times less CO2 than beef

Carbon footprint compared

Beyond nutritional considerations, the environmental aspect deserves attention.

Cattle farming is one of the sectors that emits the most greenhouse gases. According to data from ADEME and FAO, the production of one kilogram of beef generates between 28 and 60 kg of CO2 equivalent, taking into account farming, animal feed, transport, and processing.

Studies published in Frontiers in Marine Science have demonstrated that algaculture has one of the lowest carbon footprints among all protein sources. Even better: algae act as carbon sinks and absorb dissolved CO2 in the water during their growth, thus contributing to climate change mitigation (Duarte and others., 2017). They have a negative carbon footprint.

No land, no pesticides, zero fresh water

Nori grows in the sea, on nets or floating structures. This cultivation does not require:

  • No agricultural land used (a significant argument when considering that 70% of the world's agricultural land is dedicated to livestock)
  • No pesticides, fungicides, herbicides used, nor chemical fertilizers used (the algae feeds on the nutrients naturally present in the water)
  • Zero fresh water (increasingly valuable resource)

In a context where 31% of French people now identify as flexitarians. (against 16% in 2022 according to the Protéines France 2024 barometer), these environmental arguments make perfect sense.

At Biovie, we have been convinced since 2007 that algae represent the nutritional food of the future. And scientific data confirm this intuition a little more each year. The global market for edible algae is growing by more than 8% per year, a sign that this awareness extends far beyond our borders.

How to incorporate nori into your protein-rich diet

How much nori do you need ?

Let's be concrete. If nori contains 40% protein, how much do you need to consume for a significant intake ?

A realistic portion of 10 to 15 sheets of nori (approximately 30 to 40 grams of dry weight) provides between 12 and 16 grams of protein. This is equivalent to a small 80-gram steak or two eggs. Of course, you are not going to consume 10 to 15 sheets of nori per day, but you can consume fresh nori or nori flakes. The sheets, however, are very easy to transport if you go on a trip.

Obviously, nori will not completely replace your usual protein sources. However, it can significantly contribute to your daily intake, especially if you are looking to reduce your meat consumption.

Nutritional recommendations suggest about 0.8 to 1 gram of protein per kilogram of body weight for a sedentary adult, and up to 1.5 to 2 grams for athletes. A few sheets of nori per day can easily cover 15 to 20% of these needs.

5 ways to consume nori (beyond sushi)

Nori is not just for makis! Here's how I personally incorporate it into my daily life:

1. In flakes in salads : Simply crumble nori sheets over your salads. Two to three tablespoons add a touch of umami and a subtle yet real protein boost.

2. In raw soups and broths : Add pieces of fresh or dehydrated nori to your miso soups, homemade ramen, or even your vegetable soups. The seaweed rehydrates and releases its nutrients.

3. A natural snack : Lightly toasted nori sheets make for a crispy and satisfying snack. Some people add a touch of salt or sesame to them.

4. In the smoothies : Yes, it may be surprising, but a sheet of nori or mixed nori flakes in a green smoothie goes completely unnoticed while enriching the preparation.

5. In "seaweed tartare": Our gourmet seaweed mix (Dulse, nori, sea lettuce) allows for the preparation of plant-based tartares with exceptional nutritional richness.

The advantage of our low-temperature dried organic nori sheets, it is their versatility. Gentle drying not only preserves the nutrients but also the texture and flavor, allowing for a wide range of uses.

Le nori dans une alimentation protéinée

FAQ - Your questions about nori and proteins

How much protein does nori contain ?

Dehydrated nori contains 30 to 50% protein. of its dry weight, an average of 40%. This is twice as much as raw beef (17-23%) and one of the highest contents in the plant kingdom, just behind spirulina (Fleurence). and others., 2012).

Is nori a complete protein ?

Yes, nori contains the 9 essential amino acids. that our body cannot synthesize. Studies published in Marine Drugs and Food Chemistry confirm that its protein profile is comparable to that of an egg (Peñalver and others., 2020; Wong & Cheung, 2000). Lysine is slightly limiting but easily compensated for by a varied diet.

How much nori to eat per day for protein ?

A serving of 10 to 15 sheets of nori (30-40g) provides 12 to 16 grams of protein., which is equivalent to a small 80-gram steak. In flakes, add 2 to 3 tablespoons to your salads, soups, or smoothies for a daily protein boost.

What is the difference between nori and spirulina in terms of protein ?

Spirulina is more concentrated in proteins (60-70%). but nori offers unique benefits: bioavailable vitamin B12 (Watanabe and others., 2014), directly assimilable omega-3 EPA (Kumari and others., 2010), and superior culinary versatility. Nori is easily cooked on a daily basis, whereas spirulina is more commonly used as a supplement.

Is nori suitable for athletes ?

Yes. Its high content of complete proteins, richness in iron (which aids in the transport of oxygen to the muscles), and magnesium (which contributes to normal muscle function) make it an interesting ally for athletes. Additionally, its omega-3 content supports the proper functioning of the body after exertion (MacArtain). and others., 2007).

Does nori contain vitamin B12 ?

Yes, nori is one of the few plant-based sources of bioactive B12. Dr. Watanabe's studies published in Nutrients confirm a content of 30 to 60 µg per 100g of dried nori, which is well above the recommended daily intake of 2.4 µg (Watanabe). and others., 2014). It is a major asset for people following a vegan or vegetarian diet.

Are there any risks with the iodine in nori ?

Nori is the seaweed with the most moderate iodine content. (16-20 µg/g), much less than kombu (1500+ µg/g). Regular consumption of a few leaves per week poses no problem for healthy individuals. In case of thyroid disorders, consult your healthcare professional.

Conclusion

The data is there: with 40% complete proteins, an exceptional richness in B12 and iron, a carbon footprint 50 times lower than that of beef, nori fully deserves its title as a superfood.

Honestly, after 18 years of working with seaweed at Biovie, I am still impressed by the nutritional density of this little green leaf. It's no coincidence that the Japanese, among the longest-living populations in the world, have been consuming it daily for centuries.

Of course, nori will not completely replace meat in your diet, and that is not the goal anyway. But it can serve as a partial alternative, delicious and environmentally responsible to diversify your sources of protein.

And there you have it, you now have all the keys to incorporate nori into your diet with full understanding. If you wish to discover our low-temperature dried organic nori sheets or our fresh nori BRETALG, you will find them in our store.

A varied and balanced diet and a healthy lifestyle are important. The information presented in this article does not replace personalized medical advice.

Bibliographic references

Duarte, C. M., Wu, J., Xiao, X., Bruhn, A., & Krause-Jensen, D. (2017). Can Seaweed Farming Play a Role in Climate Change Mitigation and Adaptation? Frontiers in Marine Science, 4, Article 100.
DOI : https://doi.org/10.3389/fmars.2017.00100

Fleurence, J., Morançais, M., Dumay, J., Decottignies, P., Turpin, V., Munier, M., Garcia-Bueno, N., & Jaouen, P. (2012). What are the prospects for using seaweed in human nutrition and for marine animals raised through aquaculture? Trends in Food Science & Technology, 27(1), 57-61.
DOI : https://doi.org/10.1016/j.tifs.2012.03.004

Holdt, S. L., & Kraan, S. (2011). Bioactive compounds in seaweed: functional food applications and legislation. Journal of Applied Phycology, 23(3), 543-597.
DOI : https://doi.org/10.1007/s10811-010-9632-5

Kumari, P., Kumar, M., Gupta, V., Reddy, C. R. K., & Jha, B. (2010). Tropical marine macroalgae as potential sources of nutritionally important PUFAs. Food Chemistry, 120(3), 749-757.
DOI : https://doi.org/10.1016/j.foodchem.2009.11.006

MacArtain, P., Gill, C. I., Brooks, M., Campbell, R., & Rowland, I. R. (2007). Nutritional value of edible seaweeds. Nutrition Reviews, 65(12), 535-543.
DOI : https://doi.org/10.1111/j.1753-4887.2007.tb00278.x

Peñalver, R., Lorenzo, J. M., Ros, G., Amarowicz, R., Pateiro, M., & Nieto, G. (2020). Seaweeds as a Functional Ingredient for a Healthy Diet. Marine Drugs, 18(6), Article 301.
DOI : https://doi.org/10.3390/md18060301

Watanabe, F., Yabuta, Y., Bito, T., & Teng, F. (2014). Vitamin B12-Containing Plant Food Sources for Vegetarians. Nutrients, 6(5), 1861-1873.
DOI : https://doi.org/10.3390/nu6051861

Wong, K. H., & Cheung, P. C. K. (2000). Nutritional evaluation of some subtropical red and green seaweeds: Part I — proximate composition, amino acid profiles and some physico-chemical properties. Food Chemistry, 71(4), 475-482.
DOI : https://doi.org/10.1016/S0308-8146(00)00175-800175-8)

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