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GainStation13/code/mechanics/fatness.dm

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+#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
+