It’s quite distasteful. Your last meal is usually to blame if there’s a bad taste lingering in your mouth — but it could also be a sign you’re sick. So if something’s sour — or stale or rotten or just ...

Unusual changes in how food tastes are often overlooked. A bitter aftertaste, metallic sensation, or sudden dullness in flavour might be dismissed as harmless or temporary. Yet these symptoms are ...