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SELECT *
FROM flavours_without_borders.food
WHERE food.food_id NOT IN (
SELECT food.food_id
FROM (
SELECT ingredient.ingredient_name
FROM flavours_without_borders.user_follows_diet
JOIN flavours_without_borders.diet
ON user_follows_diet.diet_id = diet.diet_id
JOIN flavours_without_borders.diet_prohibits_ingredient
ON diet.diet_id = diet_prohibits_ingredient.diet_id
JOIN flavours_without_borders.ingredient
ON diet_prohibits_ingredient.ingredient_name = ingredient.ingredient_name
WHERE user_follows_diet.user_id = 12
UNION
SELECT ingredient.ingredient_name
FROM flavours_without_borders.user_prohibits_ingredient
JOIN flavours_without_borders.ingredient
ON user_prohibits_ingredient.ingredient_name = ingredient.ingredient_name
WHERE user_prohibits_ingredient.user_id = 12
) AS z
JOIN flavours_without_borders.food_has_ingredient
ON z.ingredient_name = food_has_ingredient.ingredient_name
JOIN flavours_without_borders.food
ON food_has_ingredient.food_id = food.food_id
)