Answer: This can be a difficult question. Generally, if the “foreign” object is something that is natural and can be anticipated (a chicken bone in chicken, a hard peanut in an M&M, a seed in fruit), then the food manufacturer may not be deemed negligent, and therefore, not responsible.
Do NOT give them the package or the object. Seek counsel with an experienced personal injury attorney.
Remember, product defects can be very complex issues. Make sure you have the right injury law firm to handle your case. A firm with experience can truly make all the difference in your case. Get facts, stop guessing.