Protein Day (Tanpakushitsu no Hi)
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What Is Protein Day?
September 11 is "Protein Day" in Japan, established by Meiji Co., Ltd., a food company known for milk and dairy products, confectionery, and sports nutrition. Of the amino acids that make up protein, 9 are "essential amino acids" that the body cannot produce on its own, while 11 are "non-essential amino acids" that the body can make itself. The date combines the numbers "9" and "11" to represent these two groups, and the aim is to let more people know the importance of getting enough protein.
The Origins and Background of Protein Day
Protein is the nutrient that forms the building blocks of muscles, organs, skin, hormones, and other tissues throughout the body. It's made up of 20 different amino acids, 9 of which the body cannot synthesize on its own and must obtain through diet — these are known as "essential amino acids." This anniversary was certified and registered by the Japan Anniversary Association in 2021.
- Origin: 9 essential amino acids + 11 non-essential amino acids = 20 amino acids total
- Established by: Meiji Co., Ltd. (registered with the Japan Anniversary Association in 2021)
- Purpose: To promote understanding of the importance of protein
Trivia About Protein
- The 9 essential amino acids: Valine, leucine, isoleucine, threonine, methionine, lysine, phenylalanine, tryptophan, and histidine.
- The Japanese word: protein is written "蛋白質" (tanpakushitsu) in kanji; "蛋" means egg, because protein is the main component of egg white.
- Where "protein" comes from: the English word is said to derive from a Greek word meaning "of first importance."
- Foods rich in protein: Meat, fish, eggs, soy products, and dairy are all major sources.
- Risks of deficiency: Not getting enough protein can lead to muscle loss and a weakened immune system.
Tips for Enjoying Protein Day
Take this day as a chance to reflect on whether your meals include a good balance of meat, fish, soy products, and dairy. Planning meals with protein in mind is a great first step toward better health.