Oestrogen plays a role in saliva production and maintaining healthy, moist mucous membranes in the mouth. When oestrogen levels drop during menopause, saliva production decreases, leading to a drier mouth. Another consequence of declining oestrogen levels is reduced collagen production, which can make mucous membranes thinner and more sensitive. A dry mouth caused by insufficient saliva is medically known as "xerostomia."
Reduced saliva can also change how flavours are perceived. Many women report experiencing salty, bitter, or metallic tastes, making food less enjoyable. Saliva breaks down food into small particles (chemicals) that your taste buds detect as different flavours. When the mouth becomes drier, taste perception changes.
There is limited research on how many women experience dry mouth during menopause. In one study of over 2,000 women, 40% reported noticing changes in their mouth, but almost none were aware that hormones could play a role.
Another small study shows that taste perception declines further after menopause. Dry mouth and unpleasant tastes become more common. This is likely due not only to menopause but also to ageing. As you age, taste buds function less effectively, and flavours are perceived less intensely.