Why Your Sense of Taste Changes—and How to Fix It

Many people experience changes in their sense of taste at some point in their lives. This can range from a metallic flavour in the mouth to a complete loss of taste. While the issue can affect anyone, it becomes more common with age, with around one in four older adults reporting some form of taste impairment.

The causes vary widely, from everyday infections to long-term health conditions and even normal ageing. However, in many cases, simple lifestyle adjustments or treating the underlying problem can help restore taste function.

Taste problems often stem from temporary or chronic health issues. Common infections like colds, flu, sinusitis, and Covid-19 frequently disrupt taste, usually because they also affect the sense of smell. Even short-term nasal congestion can dull flavour perception, as smell plays a key role in how we experience taste.

Certain medications are another common trigger. Drugs for blood pressure, thyroid conditions, and lithium can alter taste or cause dry mouth, which further reduces flavour sensitivity. Nutritional gaps—particularly low levels of zinc, vitamin B12, or folate—may also lead to taste disturbances. Meanwhile, smoking damages nerve cells linked to taste, though quitting can gradually reverse some of these effects.

Long-term conditions can have a bigger impact. Gum disease, such as gingivitis or periodontal disease, doesn't just cause bad breath—it can also impair taste by irritating the mouth's nerve endings. Nervous system disorders, autoimmune diseases, and even normal ageing can wear down taste receptors over time. While statistics on how many older adults face these issues remain limited, experts agree that maintaining good dental hygiene, quitting smoking, and managing underlying health problems can often improve taste function.

Taste impairment can arise from infections, medications, or chronic health problems, but it isn't always permanent. Addressing the root cause—whether through medical treatment, dietary changes, or lifestyle adjustments—can make a noticeable difference. For older adults, in particular, staying proactive about oral and overall health may help preserve taste sensitivity for longer.