As long as you are planning to do something to cook it then I can't see it being a problem since it was apparently fine yesterday. Would depends how it looks/smells though sometimes you can tell it's not okay.
I think when it comes to sell by dates it really depends on what kind of food it is. Personally I wouldn't eat meat or diary products that are past their sell by dates, but I may do with things like crisps, chocolate and pasta. I suppose as long as it's been in your fridge or freezer since you bought it, there is no sign of rot or mould and it doesn't smell bad then it might be okay.
You can usually tell the quality of most fresh food by smell and touch. If the meat is sticky and smells then generally it will be off however, the use by date will normally give the supermarket a few days safety net.
Smoking is a way of preserving food though, which means you probably have even longer than past the use by date than you do with most fresh meat or fish.
Actually, the expiration (or use by) date on the packaging has to be three months prior to the actual expiration date of the product. My neighbour works at a food manufacturing company and recently brought me like 10 bags of french fries, which were all over the expiration date. He said they were unfit for sale, because of the "date", but completely suitable for consumption I'm not sure if that was because they were frozen, I'm sure with dairy products it would be a lot less than 3 months, however I think you'll be fine.
(Original post by beccafairy)
it depends if it actually says use by - that date tends to be more strict, whereas with 'best before' it's safe to leave it a few days.
Best before dates can be used up months after expiry. Crisps/biscuits may go stale but things like pasta/rice and dry produce will be absolutely fine. Obviously check to ensure they aren't spoilt but I've used many things past the best before and not suffered.
Weirdly enough my dad eats cheese/yoghurt that has pretty much gone off and he's fine. His immune system must be pretty strong.