Often the taste of food and the body's sensitivity to certain tastes change gradually as well. During childhood, the taste buds are very sensitive to bitter tastes such as coffee and vegetables. After age 65, sensitivity to all tastes tends to weaken, usually because of a loss of smell, which is the major cause of taste loss.

Loss of smell is commonly the result of old age, but it can also be due to colds, sinus or oral infections, smoking, allergies or growths in the nasal passages. Other causes of impaired or altered taste include cavities, poor oral hygiene, heartburn, medical conditions (e.g., gastroesophageal reflux disease, ear conditions, diabetes, oral or brain cancer), certain vitamin B or zinc deficiencies, head or nose or mouth injury, chemotherapy or radiation treatment.

More than 2 million Americans have a taste/smell disorder, prompting 200,000 doctor visits a year, according to the American Rhinologic Society. Check with a doctor if you think you have a problem.

Taste tips

If your taste buds are just plain bored, remember that variety is the spice of life. If you're one of the millions of people on a salt-restricted diet, for example, consider adding zing with fresh herbs, spices, salt substitutes, citrus juice, grated citrus peel, garlic, onion, peppers or salsa. If you're simply tired of the same old foods, explore ethnic markets and produce stands -- you'll find amazing foods you didn't even know existed.