All creatures with a sense of taste use it to help them select nutritious food. You will rediscover that good tasting food is more satisfying than everyday fare. You will quickly learn that HIGH BRIX food actually tastes wonderful. Interestingly, once you rediscover the great taste of high brix food, you may find the artificial flavorings you once tolerated objectionable. Certainly, you will find it difficult to eat poorer quality fruits & vegetables so easily as your taste sense is once again "recalibrated" to the great flavor of higher brix produce.
The refractometer is a tool---no more---no less. It is used to help you select HIGHER QUALITY foods containing more vitamins and minerals. You will immediately notice the direct relation between flavor and brix. You should find the refractometer quickly helping you regain your ability to select good food by taste alone. This re-developed skill can serve you well at both restaurant and supermarket.
However, you should remember that variety affects taste. That will not change the fact that a high brix item of any produce is better tasting than a low brix item of the same produce. For instance, some people prefer tart apples and some like sweet varieties. An excellent quality Winesap apple, while wonderful to some eaters, may be too tart for those who like, say, Red Delicious. In like manner the 42 brix specialty wine grape often holds small attraction for the connoisseur of eating grapes, who may be ecstatic at finding a 24 brix Ribier.