> To adhere with the requisite language outlined, any food products with a date label — with the exception of infant formula, eggs, beer, and malt beverages — must state “Best if Used By” to indicate peak quality, and “Use By” to designate food safety. Infant formula is required federally, so OK. Eggs are an oddly specific one, but I guess I can see it (although I'd wonder why some other products like milk, or meat m…
I'm actually super curious about that too, as far as I know pathogens cant live in beer, so I don't know how it can go bad. I wonder though if local brewery's or more artigianale brewing processes are different and maybe could be a bit riskier ?
Brettanomyces will make your beer taste phenolic. Lactic Acid Bacteria will sour it (Lactobacillus and Pediococcus are two common contaminants).
Oxygenation will gradually make the beer taste like cardboard.
Hop aromatics degrade rapidly, heavily hopped beers are best within a month of brewing.
Very few beers get better over time (generally sours and stouts), most are beginning to degrade immediately and fall off a cliff within a year.