Further refinement of nutrition/thirst procs.

code/modules/mob/living/carbon/human/human.dm

@@ -1293,10 +1293,11 @@
 
 /mob/living/carbon/human/handle_nutrition_and_hydration()
 	..()
-	apply_nutrition_and_hydration_stressors()
 
-/mob/living/carbon/human/proc/apply_nutrition_and_hydration_stressors()
-	SHOULD_CALL_PARENT(TRUE)
+	// Apply stressors.
+	if(!client)
+		return
+
 	var/nut =    get_nutrition()
 	var/maxnut = get_max_nutrition()
 	if(nut < (maxnut * 0.3))

code/modules/mob/living/life.dm

@@ -51,13 +51,33 @@
 
 	return 1
 
-/mob/living/proc/handle_nutrition_and_hydration()
+/mob/living/proc/experiences_hunger_and_thirst()
+	return TRUE
+
+/mob/living/proc/get_hunger_factor()
+	var/decl/species/my_species = get_species()
+	if(my_species)
+		return my_species.hunger_factor
+	return 0
+
+/mob/living/proc/get_thirst_factor()
 	var/decl/species/my_species = get_species()
 	if(my_species)
-		if(nutrition > 0 && my_species.hunger_factor)
-			adjust_nutrition(-(my_species.hunger_factor))
-		if(hydration > 0 && my_species.thirst_factor)
-			adjust_hydration(-(my_species.thirst_factor))
+		return my_species.hunger_factor
+	return 0
+
+/mob/living/proc/handle_nutrition_and_hydration()
+	SHOULD_CALL_PARENT(TRUE)
+	if(!experiences_hunger_and_thirst())
+		return
+	if(get_nutrition() > 0)
+		var/hunger_factor = get_hunger_factor()
+		if(hunger_factor)
+			adjust_nutrition(-(hunger_factor))
+	if(get_hydration() > 0)
+		var/thirst_factor = get_thirst_factor()
+		if(thirst_factor)
+			adjust_hydration(-(thirst_factor))
 
 /mob/living/proc/handle_breathing()
 	return

code/modules/mob/living/silicon/silicon.dm

@@ -75,8 +75,8 @@
 	QDEL_NULL_LIST(stock_parts)
 	return ..()
 
-/mob/living/silicon/handle_nutrition_and_hydration()
-	return // Doesn't really apply to robots. Maybe unify this with cells in the future.
+/mob/living/silicon/experiences_hunger_and_thirst()
+	return FALSE // Doesn't really apply to robots. Maybe unify this with cells in the future.
 
 /mob/living/silicon/get_nutrition()
 	return get_max_nutrition()

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -643,8 +643,9 @@ var/global/list/simplemob_icon_bitflag_cache = list()
 /mob/living/simple_animal/proc/can_act()
 	return !(QDELETED(src) || incapacitated() || (is_aquatic && !submerged()))
 
-/mob/living/simple_animal/handle_nutrition_and_hydration()
-	return // They need a reliable way to recover nutrition/hydration before this is made general.
+/mob/living/simple_animal/experiences_hunger_and_thirst()
+	// return !supernatural && !isSynthetic()
+	return FALSE // They need a reliable way to recover nutrition/hydration before this is made general.
 
 /mob/living/simple_animal/get_nutrition()
 	return get_max_nutrition()

mods/content/xenobiology/slime/_slime.dm

@@ -22,13 +22,13 @@
 	bone_amount = 0
 	ai = /datum/ai/slime
 	hud_type = /datum/hud/slime
+	nutrition = 800
 
 	var/is_adult = FALSE
 	var/mutation_chance = 30 // Chance of mutating, should be between 25 and 35
 	var/powerlevel = 0 // 0-10 controls how much electricity they are generating
 	var/amount_grown = 0 // controls how long the slime has been overfed, if 10, grows or reproduces
 	var/weakref/feeding_on
-	var/nutrition = 800
 	var/toxloss = 0
 	var/hurt_temperature = T0C-50 // slime keeps taking damage when its bodytemperature is below this
 	var/die_temperature = 50 // slime dies instantly when its bodytemperature is below this
@@ -292,6 +292,12 @@
 /mob/living/slime/check_has_mouth()
 	return 0
 
+/mob/living/slime/set_nutrition(amt)
+	..()
+
+/mob/living/slime/get_hydration()
+	return get_nutrition()
+
 /mob/living/slime/proc/gain_nutrition(var/amount)
 	adjust_nutrition(amount)
 	if(prob(amount * 2)) // Gain around one level per 50 nutrition
@@ -300,12 +306,6 @@
 			powerlevel = 10
 			adjustToxLoss(-10)
 
-/mob/living/slime/get_nutrition()
-	return nutrition
-
-/mob/living/slime/adjust_nutrition(var/amt)
-	nutrition = clamp(nutrition + amt, 0, get_max_nutrition())
-
 /mob/living/slime/proc/get_hunger_state()
 	. = 0
 	if (nutrition < get_starve_nutrition())

mods/content/xenobiology/slime/life.dm

@@ -80,9 +80,13 @@
 	if(length(contents) != last_contents_length)
 		queue_icon_update()
 
-/mob/living/slime/handle_nutrition_and_hydration()
+/mob/living/slime/get_hunger_factor()
+	return (0.1 + 0.05 * is_adult)
+
+/mob/living/slime/get_thirst_factor()
+	return 0
 
-	adjust_nutrition(-(0.1 + 0.05 * is_adult))
+/mob/living/slime/handle_nutrition_and_hydration()
 
 	// Digest whatever we've got floating around in our goop.
 	if(length(contents))