This is another of my favorite senses. I love food! Who doesn't?! Yet, when we eat, we tend to shove food into our mouths without thought to take the time to enjoy it. Rarely do we savor every bite, dissecting the flavors, textures, and sensations.
Scientists have determined that basically we have five tastes that our tongues are sensitive to: salt, sweet, bitter, sour, and unami (which is the taste of MSG). Unami is 'savory' or 'meaty' in Japanese and refers to the sensation of savoriness. There's an ongoing debate about additional tastes ie: astringent and pungent; and whether the sensation of false coolness and false heat should be considered as well. False coolness is the feeling you get from spearmint or menthol, while false heat is the 'hot' or 'spicy' usually found in Indian, Szechuan, Mexican, or Thai foods.
When you go to the grocery store, look for foods you wouldn't normally eat. In the fruit and vegetable section alone there are ALL kinds of interesting new things to try. Dragonfruit, breadfruit, Kiwi, Jicama, pomegranate, I can go on and on. Use the internet to find recipes for the new foods if you are unsure how to prepare or serve them.
Find foods that are outside your normal, everyday. Savor, test, embrace. Pay attention to what you eat, what is going into your body. Notice the effects of that food on your body; is it positive or negative?