Not trying to make you even more paranoid...but you can get poisoned from anything. Since you're stuck on food, you can get food poisoning as well from bacteria...now, I actually want you to focus on food poisoning...
Food bacteria which causes food poisoning CAN be killed before it makes you sick.
It helps boost your immune system against "poison". Maybe if you eat some everyday (very, very good for you! I do it, in fact...haven't had the flu or a cold for 4 years so far) then you might feel more at ease?