Sayyed Mohammad Al-Musawi,
Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to religious questions. In the past, he has also spent significant time in India guiding the community.
It depends whether the food is Najis or not. Najis food is not permissible to consume whether from a Muslim or non Muslim. Najis food means any food which was touched with wetness by a non Muslim (except People of Book according to some Maraaji').
If you know that the food is Najis, it will be not permissible for you to eat it at all.