Question Summary:
Does consummation of food unintentionally nullifies ones fast?

Question Detail:

 
Does a persons fast break if they unitentionnaly consume food?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykumwa-rahmatullāhiwa-barakātuh.
No, a person’s fast does not break if he unintentionally consumes food. (1) 
And Allah Ta’āla Knows Best
Zakir Husain
Student DarulIftaa
Michigan, U.S.A
Checked and Approved by,
Mufti Ebrahim Desai.
فان أكل الصائم أو شرب أو جامع ناسيا لم يفطر(الباب في شرح الكتاب ص ١٧٣ ) (1)