diff --git a/code/datums/traits/negative.dm b/code/datums/traits/negative.dm
index 93752f2014a3..9f0c38967cbb 100644
--- a/code/datums/traits/negative.dm
+++ b/code/datums/traits/negative.dm
@@ -985,3 +985,35 @@
 	if(!old_limb.is_organic_limb())
 		cybernetics_level--
 		update_mood()
+
+/datum/quirk/lactose_intolerance
+	name = "Lactose Intolerance"
+	desc = "You don't tolerate milk or other dairy products."
+	icon = "utensils"
+	gain_text = span_danger("You suddenly feel intolerant towards milk.")
+	lose_text = span_notice("You feel like you could drink milk again.")
+	medical_record_text = "Patient is lactose intolerant."
+	value = -1
+
+/datum/quirk/lactose_intolerance/check_quirk(datum/preferences/prefs)
+	var/datum/species/species_type = prefs.read_preference(/datum/preference/choiced/species)
+	if(initial(species_type.toxic_food) & DAIRY)
+		return "You're already lactose intolerant!"
+	species_type = new species_type()
+	if((TRAIT_POWERHUNGRY in species_type.inherent_traits) || (TRAIT_NOHUNGER in species_type.inherent_traits))
+		return "You don't eat food!"
+	return FALSE
+
+/datum/quirk/lactose_intolerance/add()
+	if(!ishuman(quirk_holder))
+		return
+	var/mob/living/carbon/carbon_holder = quirk_holder
+	var/datum/species/spec = carbon_holder.dna.species
+	spec.toxic_food |= DAIRY
+	RegisterSignal(carbon_holder, COMSIG_SPECIES_GAIN, PROC_REF(on_species_gain))
+
+/datum/quirk/lactose_intolerance/remove()
+	UnregisterSignal(quirk_holder, COMSIG_SPECIES_GAIN)
+
+/datum/quirk/lactose_intolerance/proc/on_species_gain(datum/source, datum/species/new_species)
+	new_species.toxic_food |= DAIRY // no escape from your terrible fate
diff --git a/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm b/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
index ffa8cfb3eb51..1b8ebe15377c 100644
--- a/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
+++ b/code/modules/mob/living/carbon/human/species_types/lizardpeople.dm
@@ -26,7 +26,7 @@
 	meat = /obj/item/reagent_containers/food/snacks/meat/slab/human/mutant/lizard
 	skinned_type = /obj/item/stack/sheet/animalhide/lizard
 	exotic_bloodtype = "L"
-	disliked_food = SUGAR | VEGETABLES
+	toxic_food = parent_type::toxic_food | DAIRY
 	liked_food = MEAT | GRILLED | SEAFOOD | MICE | FRUIT
 	inert_mutation = FIREBREATH
 	deathsound = 'sound/voice/lizard/deathsound.ogg'
diff --git a/code/modules/reagents/chemistry/reagents/drink_reagents.dm b/code/modules/reagents/chemistry/reagents/drink_reagents.dm
index 8403e5b44ca8..22fd82c8408a 100644
--- a/code/modules/reagents/chemistry/reagents/drink_reagents.dm
+++ b/code/modules/reagents/chemistry/reagents/drink_reagents.dm
@@ -198,6 +198,11 @@
 	glass_desc = "White and nutritious goodness!"
 	default_container = /obj/item/reagent_containers/food/condiment/milk
 
+/datum/reagent/consumable/milk/on_mob_life(mob/living/carbon/M)
+	. = ..()
+	if(M.dna?.species?.toxic_food & DAIRY)
+		M.adjust_disgust(min(volume / 2, 5))
+
 /datum/reagent/consumable/milk/coconut
 	name = "Coconut Milk"
 	description = "An opaque white liquid produced by the mammary glands of a coconut... wait what?"