he has forbidden you only almaytatah blood the flesh of swine and any animal which is slaughtered as a sacrifice for others than allah . but if one is forced by necessity without wilful disobedience and not transgressing then allah is oftforgiving most merciful.
إنما حرم عليكم الميتة والدم ولحم الخنزير وما أهل لغير الله به فمن اضطر غير باغ ولا عاد فإن الله غفور رحيم