Beer doesn’t become unsafe to drink as it matures, but it will begin to taste flat — either because it loses flavor or develops an off-putting flavor profile. … Its proteins will still break down, just as with any other beer, but it will have been engineered to withstand the process in the first place.

Can you use flat beer for beer bread?

12 oz/341 ml Beer(flat is fine, fizzy is fine too) If you don’t care for beer use seltzer water instead.

Can you get sick from drinking flat beer?

Beer that goes bad — or flat — won’t make you sick but may upset your stomach. You should throw out beer if there’s no carbonation or white foam (head) after you pour it. You may also notice a change in taste or sediment at the bottom of the bottle.