a

GainStation13/code/mechanics/fatness.dm

@@ -0,0 +1,17 @@
+#define MINIMUM_FATNESS_LEVEL = 0
+
+/mob/living/carbon
+	///What level of fatness is the parent mob at?
+	var/fatness = 0
+	///How full is the parent mob?
+	var/fullness = FULLNESS_LEVEL_HALF_FULL
+
+///Adjusts the fatness level of the parent mob. Positive numbers increase fatness, negative numbers remove fatness.
+/mob/living/carbon/proc/adjust_fatness(adjustment_amount)
+	if(!adjustment_amount)
+		return FALSE
+	
+	fatness += adjustment_amount
+	fatness = max(adjustment_amount, MINIMUM_FATNESS_LEVEL) //It would be a little silly if someone got negative fat.
+	return TRUE
+

code/modules/mob/mob_defines.dm

@@ -60,8 +60,7 @@
 	var/drowsyness = 0//Carbon
 	var/dizziness = 0//Carbon
 	var/jitteriness = 0//Carbon
-	var/fatness = 0//Carbon, GS13 addition
-	var/fullness = FULLNESS_LEVEL_HALF_FULL//Carbon, GS13 addition
+
 	var/nutrition = NUTRITION_LEVEL_START_MIN // randomised in Initialize
 	var/thirst = THIRST_LEVEL_START_MIN	//same for this
 	var/satiety = 0//Carbon

tgstation.dme

@@ -3316,6 +3316,7 @@
 #include "code\modules\VR\vr_sleeper.dm"
 #include "code\modules\zombie\items.dm"
 #include "code\modules\zombie\organs.dm"
+#include "GainStation13\code\mechanics\fatness.dm"
 #include "GainStation13\code\modules\mob\living\emote.dm"
 #include "GainStation13\code\modules\reagents\chemistry\reagents\consumable_reagents.dm"
 #include "GainStation13\code\modules\reagents\chemistry\recipes\fatchem.dm"