Matsuya's Official X Marks September 11 'Protein Day' by Promoting Meat and Egg Menu Items

Matsuya’s official X account (@matsuya_foods) published a post on the morning of September 11 titled “Today, September 11, is ‘Protein Day.’” The post highlighted protein, essential for building a healthy body, and encouraged followers with the message, “Why not enjoy some delicious protein today with Matsuya’s meat and egg menu items?” tying the suggestion to the commemorative day. It did not name any specific products, keeping the appeal to the general category of “menu items that use meat and eggs.”

An Illustrated Chart of All 20 Essential and Non-Essential Amino Acids

The image accompanying the post features Matsuya’s official mascot Macky alongside a light bulb symbolizing a flash of insight, with two large circles arranged at the top. The left circle is labeled “9 Essential Amino Acids,” and the right circle “11 Non-Essential Amino Acids.” Around the edge of each circle, amino acids such as valine, leucine, isoleucine, methionine, and lysine are listed with color-coded spheres, their alphabetical abbreviations, and their Japanese names. The design condenses all 20 amino acids that make up protein into a single chart, with the words “Protein Day” placed prominently against a red-and-yellow radiating background — putting nutritional knowledge front and center.

“Today Is [X] Day” Posts: Health Themes Recurring Every Few Days Lately

Posts in the format “Today, [month] [day], is ‘[X] Day’” have become a recurring feature on the official X account since “Nice Day” on July 13. Health and nutrition themes in particular have followed in quick succession lately: “Vegetable Day” on August 31, “Sleep Day” on September 3, “Rest Day” on September 8, and now “Protein Day” on September 11 — each posted at a pace of roughly every three to five days. That’s a notable increase from July, when the same format appeared at intervals of about six to fifteen days.

Opening with the emoticon “( ¯꒳¯ )” is also a shared trait across this series, and this post places the same emoticon right after the name of the commemorative day in its first line. Two emoji, “✨” and “😊,” appear in the post, which closes with the line “Let’s have a great day today too!” More recently, a post for “Meat Day” on August 29 explicitly named two bowl items available only that day, showing that whether specific products are named varies even within the same commemorative-day format.

How Much Protein Matsuya’s Meat and Egg Menu Items Actually Provide

So how much protein do the “menu items that use meat and eggs” the post promotes actually provide? According to Matsuya’s published nutritional data, the chicken-based Chunky Stewed Chicken Curry and Rice contains 47.6g of protein (1,257 kcal), while the pork-based Pork & Kimchi Set Meal, in Regular Serving size, contains 46.7g of protein (1,273 kcal) — both delivering protein in the high 40-gram range per meal. Nutritional data for meat-centered items such as the Salt-based Green Onion Pork Loin Bowl and the Beef Bibim Bowl has also been updated one after another recently, aligning the commemorative-day messaging with the actual menu lineup.