Question Summary:
What should one do with impermissible food items?

Question Detail:

What should one do with impermissible food items?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
 As-salāmu `alaykum wa-rahmatullāhi wa-barakātuh.
1. It is not permissible to give any consumable items which contain Haraam (forbidden) elements to human beings, animals or any other creature.[1]
2. In principle, one will have to dispose of consumable items which contain Haraam elements.[2]
3. Disposing of such items is not considered as Israaf. Since, Israaf is only applicable to Halaal (permissible) items.[3]
4. If Haraam items are left in any place and if someone takes them away, you will not be responsible for giving away Haraam.[4] 
And Allah knows best.
Ismail Desai,
Durban, South Africa
Student Darul Iftaa
Checked and Approved
Mufti Ebrahim Desai
daruliftaa.net