diff --git a/code/__DEFINES/genetics.dm b/code/__DEFINES/genetics.dm
index 5124d27e9f5..c982420ff2a 100644
--- a/code/__DEFINES/genetics.dm
+++ b/code/__DEFINES/genetics.dm
@@ -150,3 +150,4 @@
 #define PIERCEIMMUNE	"pierce_immunity"
 #define NO_HUNGER		"no_hunger"
 #define EXOTIC_COLOR	"exotic_blood_colour"
+#define NO_OBESITY		"no_obesity"
diff --git a/code/modules/client/preference/preferences.dm b/code/modules/client/preference/preferences.dm
index 6d3d65fb045..46129c9c1d3 100644
--- a/code/modules/client/preference/preferences.dm
+++ b/code/modules/client/preference/preferences.dm
@@ -867,7 +867,8 @@ GLOBAL_LIST_INIT(special_role_times, list( //minimum age (in days) for accounts
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_BLIND, "Blind")
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_DEAF, "Deaf")
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_MUTE, "Mute")
-	HTML += ShowDisabilityState(user, DISABILITY_FLAG_FAT, "Obese")
+	if(!(NO_OBESITY in S.species_traits))
+		HTML += ShowDisabilityState(user, DISABILITY_FLAG_FAT, "Obese")
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_NERVOUS, "Stutter")
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_SWEDISH, "Swedish accent")
 	HTML += ShowDisabilityState(user, DISABILITY_FLAG_CHAV, "Chav accent")
diff --git a/code/modules/mob/living/carbon/human/life.dm b/code/modules/mob/living/carbon/human/life.dm
index c9cd99ad2d0..868fb522fd9 100644
--- a/code/modules/mob/living/carbon/human/life.dm
+++ b/code/modules/mob/living/carbon/human/life.dm
@@ -597,7 +597,7 @@
 			if(overeatduration < 100)
 				becomeSlim()
 		else
-			if(overeatduration > 500)
+			if(overeatduration > 500 && !(NO_OBESITY in dna.species.species_traits))
 				becomeFat()
 
 		// nutrition decrease
diff --git a/code/modules/mob/living/carbon/human/species/skrell.dm b/code/modules/mob/living/carbon/human/species/skrell.dm
index e0710bec11f..e65196ee2f8 100644
--- a/code/modules/mob/living/carbon/human/species/skrell.dm
+++ b/code/modules/mob/living/carbon/human/species/skrell.dm
@@ -13,7 +13,7 @@
 	the secrets of their empire to their allies."
 
 
-	species_traits = list(LIPS)
+	species_traits = list(LIPS, NO_OBESITY)
 	clothing_flags = HAS_UNDERWEAR | HAS_UNDERSHIRT | HAS_SOCKS
 	bodyflags = HAS_SKIN_COLOR | HAS_BODY_MARKINGS
 	dietflags = DIET_HERB