So can you actually get your immune system to get more resistant

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So can you actually get your immune system to get more resistant to bad food ? Ever since I've been a kid I've been "training" myself to resist food poisoning :

>Eat food way past the expire date, as long as it's not moldy it's fine
>Even then I often ate moldy food because I didn't pay attention
>Make a point of eating in the shadiest, most ghetto restaurants and food stands
>Never throw away food that's fallen on the ground, even in the street
>Always eat in dirty plates, often months on end
>Never wash my pans, the accumulated flavours can make anything taste good

I've never been sick from food in my life, except once when I ate something red I found in a jar at the back of my mum's fridge after she died, and I'm pretty sure it was either wax from cheese or some kind of rotten pepper paste