My Korean Apple Vinegar that has probably expired liao is still
sitting in my larder. I never bother to look at expiry dates
for salt nor sugar.
However, for meat products, I will look at the expiry dates. And
you should too! Seafood should not be kept frozen for longer
than 2 months, all other meats for 3 months, I think. After
that, if you still want to eat it, it's your business!
I have eaten yogurt that's one month past expiry date but any
longer than that and it goes straight into the bin.
Bread, cakes, etc dry out anyways even if they haven't grown
mouldy. I wouldn't want to grow fat eating stale, yucky
stuff. If I will grow fat anyways, I wanna grow fat eating
good stuff. 
I've eaten lots of meat 2 yrs past expiry and I'm still alive
and not suffered from erhmm active intestines. Haha
It really depends on your handling.
