“How do German breads greet each other?/“By saying ‘Gluten Tag!’”

“Guten Tag!” is German for “Good day!” A popular food pun is “Gluten Tag!” “Was talking with Toby today about opening a bakery with an emphasis on central & eastern European bread and food. Name: ‘Gluten Tag’” was posted on Twitter on January 14, 2010.
 
“How do German bakers greet each other?  Gluten Tag!” was posted on Twitter on January 7, 2011. “How do you greet a German bread baker? ‘Gluten tag!’” was posted on Twitter on September 26, 2011.
   
“What does a German loaf of bread say when he meets someone new?..................................Gluten Tag!” was posted on Twitter on July 16, 2012. “What did one German bread say to the other? 😉 — Omg gluten tag” was posted on Twitter on September 29, 2012.
   
“What do you call a game where Germans throw bread at each other?”/“Gluten tag” is a related joke.
 
     
Wiktionary: guten Tag
Etymology
In accusative case, because it is short for ich wünsche einen guten Tag! “I wish [you] a good day!”.
Interjection
guten Tag
1. good day, good afternoon
2. hello
     
Wikipedia: Gluten
Gluten (from Latin gluten, “glue”) is a composite of storage proteins termed prolamins and glutelins and stored together with starch in the endosperm (which nourishes the embryonic plant during germination) of various cereal (grass) grains. It is found in wheat, barley, rye, oat, related species and hybrids (such as spelt, khorasan, emmer, einkorn, triticale, kamut, etc.) and products of these (such as malt). Glutens, and most especially the Triticeae glutens, are appreciated for their viscoelastic properties. It gives elasticity to dough, helping it rise and keep its shape and often gives the final product a chewy texture.
 
Wikipedia: Coeliac disease
Coeliac disease, also spelled celiac disease, is a long-term autoimmune disorder primarily affecting the small intestine that occurs in people who are genetically predisposed. Classic symptoms include gastrointestinal problems such as chronic diarrhoea, abdominal distention, malabsorption, loss of appetite, and among children failure to grow normally. This often begins between six months and two years of age. Non-classic symptoms are more common, especially in people older than two years. There may be mild or absent gastrointestinal symptoms, a wide number of symptoms involving any part of the body, or no obvious symptoms. Coeliac disease was first described in childhood; however, it may develop at any age. It is associated with other autoimmune diseases, such as diabetes mellitus type 1 and thyroiditis, among others.
 
Coeliac disease is caused by a reaction to gluten, which are various proteins found in wheat and in other grains such as barley, and rye. Moderate quantities of oats, free of contamination with other gluten-containing grains, are usually tolerated.
   
Twitter     
Art D.‏
@ADrauglis
Was talking with Toby today about opening a bakery with an emphasis on central & eastern European bread and food. Name: “Gluten Tag”
5:43 PM - 14 Jan 2010
 
Twitter     
Nat Torkington‏
@gnat
Mr 11 made up a joke: “How do German bakers greet each other?  Gluten Tag!”
10:59 PM - 7 Jan 2011
 
Twitter
Peter Aldrich‏
@peter_aldrich
How do you greet a German bread baker? “Gluten tag!”
5:04 PM - 26 Sep 2011
     
Twitter
J. Elmo Fagg, Founder & Leader, Blue Ridge Quartet‏
@hoover_dam
note to self: open German style bakery, call it Gluten Tag
12:54 PM - 1 Mar 2012
 
Twitter
Fester’s Quest‏
@spoocecow
Gluten Tag = “Bread Day”
10:04 PM - 26 Mar 2012
   
Twitter
Lilac‏
@slowb1rd
What does a German loaf of bread say when he meets someone new?..................................Gluten Tag!
6:35 PM - 16 Jul 2012
   
Twitter
Jacob Carew‏
@Jacob_Carew
Who is up for a german game called Gluten tag, where whoever has the loaf of bread is it
8:52 AM - 13 Sep 2012
   
Twitter
✌boobz ✌‏
@B0obz_
What did one German bread say to the other? 😉 — Omg gluten tag;) this is the best joke ever I made it up:)))... http://ask.fm/a/3i3lb346g0
6:30 PM - 29 Sep 2012
 
Twitter     
Geilo Jenn‏
@FantaOfTheOpera
“How do 2 german breads greet eachother?” - “Gluten Tag.” *wieher*
7:37 PM - 31 Jan 2013
 
Reddit—Jokes
I’m gonna open a bakery in Germany.
submitted March 17, 2014 by kittehmonger
I’ll call it “Gluten Tag!”
 
Reddit—Puns
What does one German wheat plant say to another German wheat plant? (self.puns)
submitted August 11, 2014 by M8asonmiller
Gluten Tag.
 
Reddit—Dad Jokes
How do German wheatfarmers say hello? (self.dadjokes)
submitted November 18, 2014 by Not_very_lnteresting
Gluten tag
 
Reddit—Jokes
How do German bread greet each other?
submitted May 14, 2015 by MiG-21
Gluten tag!
   
Reddit—Dad Jokes
Dieting in Germany is easy… (self.dadjokes)
submitted August 26, 2015 by k-smackerel
Just look for gluten tags.
 
Reddit—3amjokes
How do you greet a German celiac self.3amjokes
Submitted October 14, 2015 by engoac
Gluten tag
 
Reddit—Jokes
What did the German baker say to greet his customers?
submitted November 23, 2015 by Odeventures
Gluten tag!
         
Reddit—Jokes
How do you greet a slice of bread in Germany?
submitted February 1, 2016 by The16BitPotato
Gluten tag! Ba-dum tss.
 
Reddit—Puns   
How do Germans with celiac disease salute each other? (self.puns)
submitted September 21, 2016 by the_chilean
Gluten Tag
 
Reddit—Jokes
How do Germans with Celiac Disease salute each other?
submitted November 4, 2016 by the_chilean
Gluten Tag!
 
Reddit—Dad Jokes
How do German breads greet each other? (self.dadjokes)
submitted January 16, 2017 by gumbystruck
By saying “Gluten Tag!”
 
Reddit—Jokes
What’s the worst thing a German can say to someone with celiac disease?
submitted September 21, 2017 by sheeptopod
Gluten tag.
 
Reddit—Jokes
How do you tell if something has gluten in a German grocery store??
submitted January 17, 2018 by RandomUser00111
The gluten tag.