“My blood type is dark roast (positive)” is a jocular coffee saying that has been printed on many images.
   
“I think my blood type is dark roast” was posted on Twitter by Mike Kemp on February 17, 2009. “My Blood Type Is Dark Roast With Cream And Sugar” was posted on Twitter by NowOnZazzle on January 12, 2010. “Quoting my friend Mittie, ‘My blood type is dark roast.’ Several transfusions required this morning” was posted on Twitter by Marti Thomas by February 22, 2010.
     
“Just got a blood test.  My blood type is Colombian Dark Roast positive” was posted on Twitter by Matthew Begue on April 21, 2011. “My blood type is dark roast positive. #coffeechat” was posted on Twitter by Eric Shimmy on October 8, 2016.
   
“My blood test came back today and my blood type changed from ‘A positive’ to ‘darkly roasted’” was posted on Twitter by Death Wish Coffee on January 31, 2018.
     
           
Wikipedia: Coffee roasting
Roasting coffee transforms the chemical and physical properties of green coffee beans into roasted coffee products. The roasting process is what produces the characteristic flavor of coffee by causing the green coffee beans to change in taste. Unroasted beans contain similar if not higher levels of acids, protein, sugars, and caffeine as those that have been roasted, but lack the taste of roasted coffee beans due to the Maillard and other chemical reactions that occur during roasting.
 
Twitter
Mike Kemp
@mikekempf5
I think my blood type is dark roast
9:32 AM · Feb 17, 2009·Twitter Web Client
   
Twitter
NowOnZazzle
@NowOnZazzle
My Blood Type Is Dark Roast With Cream And Sugar: Know someone who is a heavy coffee drinker? This could be the mu… http://bit.ly/7SYpZu
8:18 PM · Jan 12, 2010·twitterfeed
   
Twitter
Marti Thomas
@MartiThomas
Quoting my friend Mittie, “My blood type is dark roast.” Several transfusions required this morning.
10:13 AM · Feb 22, 2010·Twitter Web Client
 
Twitter
Matthew Begue
@mattbegue
Just got a blood test.  My blood type is Colombian Dark Roast positive
7:28 PM · Apr 21, 2011·Twitter Web Client
   
Twitter   
David Housholder
@LibertyHous
My blood type is dark roast coffee…
2:47 PM · Dec 26, 2011·Twitter Web Client
 
Google Groups: Grifnet
05/17/16 Grif.Net - Coffeeology
Dr. Bob
May 17, 2016, 9:22:06 AM
Meditation on my coffee cup this morning . . .
 
“Every day take time to smell the coffee”
“Hello darkness my old friend”
“Espresso yourself”
“Better latte than never”
“My blood type is dark roast Arabica positive”
 
Twitter
Eric Shimmy
@ShimmyRunner
My blood type is dark roast positive. #coffeechat
12:07 PM · Oct 8, 2016·Twitter for iPhone
     
Twitter
Death Wish Coffee
@DeathWishCoffee
My blood test came back today and my blood type changed from “A positive” to “darkly roasted”
5:00 PM · Jan 31, 2018·Hootsuite
   
Twitter
coffee folk
@coffeefoIk
My blood test came back today and my blood type changed from “A positive” to “darkly roasted”
6:40 PM · Jan 31, 2018·Twitter for iPhone
 
Twitter
RescuePoetix™
@RescuePoetix
Happy Thursday beautiful ones.
This chica type is Dark Roast Positive
#coffeelife https://instagram.com/p/BeqAcnihgoA/
8:50 AM · Feb 1, 2018·Instagram
   
Twitter
Death Wish Coffee
@DeathWishCoffee
My blood type is dark roast positive.
12:45 PM · Feb 28, 2018·Hootsuite
 
Facebook
Coffee Society
Poster’s location not shared · September 12, 2020 at 8:03 AM ·
Good morning and have a great (coffee) day
My blood type is dark roast positive.