“Transfat” and “cisfat” both exist, although the “cisfat” term is less well known. A joke treats the terms like “transgender” and “cisgender.”
     
“‘Trans fats’ implies the existence of cis fats” was posted on Twitter by Desperado D. Mayor on October 31, 2019. “trans fat implies the existence of cis fat” was posted on Twitter by “a critic for all seasons” on December 12, 2019.
   
“The existence of transfats implies the existence of cisfats and nbfats” was posted on Twitter by Dr. Soup and Sausages on June 25, 2020. “Transfat implies the existence of cisfat” was posted on Twitter by Yarn🏔 on November 20, 2020. “Transfat implies the existence of cisfat” was posted on Reddit—Showerthoughts on October 28, 2021.
   
       
Wikipedia: Fat
“Cis fat” vs. “trans fat”
In nature, unsaturated fatty acids generally have double bonds in cis configuration (with the adjacent C–C bonds on the same side) as opposed to trans. Nevertheless, trans fatty acids (TFAs) occur in small amounts in meat and milk of ruminants (such as cattle and sheep), typically 2–5% of total fat. Natural TFAs, which include conjugated linoleic acid (CLA) and vaccenic acid, originate in the rumen of these animals. CLA has two double bonds, one in the cis configuration and one in trans, which makes it simultaneously a cis- and a trans-fatty acid.
     
Twitter 
Desperado D. Mayor
@Overmayor
“Trans fats” implies the existence of cis fats
12:53 PM · Oct 31, 2019·Twitter Web App
 
Twitter   
Odda C. @ ALWAYS Tired 🔞
@OddaSykes
Random thought: Does not trans fat imply the existence of cis fat?
1:16 AM · Nov 26, 2019·Twitter Web App
   
Twitter
a critic for all seasons
@vancejmillions
trans fat implies the existence of cis fat
7:32 PM · Dec 12, 2019·Twitter for iPhone
   
Twitter
DB the Dragon Queen 💙🏳️‍⚧️🐉
@DrgnBeauty
the existence of trans fat implies the existence of a cis fat but y’all aren’t ready for that discussion
3:33 PM · Dec 21, 2019·Twitter for Android
 
Twitter
Dr. Soup and Sausages
@FieldsofAthnry
The existence of transfats implies the existence of cisfats and nbfats.
4:08 PM · Jun 25, 2020·Twitter Web App
   
Twitter   
Emberflux Terezi Era
@Emberflux
Trans fats implies the existence of cis fats.
11:50 AM · Jul 26, 2020·Twitter Web App
 
Twitter
Caleb Cassell
@ItsLikeCastle
trans fats imply the existence of cis fats
2:24 AM · Nov 7, 2020·Twitter for Android
 
Twitter
Yarn🏔
@Emerald_mp3
Transfat implies the existence of cisfat
12:31 PM · Nov 20, 2020·Twitter Web App
 
Reddit—Showerthoughts
Posted by u/AFreshlyShavedHead October 28, 2021
Transfat implies the existence of cisfat
 
Twitter
Michelle Mullins
@libisumbrae
Replying to @fatsparrowcult @KatyMontgomerie and 2 others
Oh please throughout English cis is used as the antonym of trans, cisfats and transfats for example. Cisgender or cissex are useful words with just as much backing to them as anything else used in English. Oh and how white supremacist of you to insist on two gender categories…
6:38 AM · Nov 30, 2021·Twitter for Android
 
Twitter
daniella ☽
@dznyella
trans fats imply the existence of cis fats
8:43 PM · Feb 15, 2022·Twitter for iPhone