After teaching students about age-related changes in the sense of taste in older adults, the instructor determines that teaching was successful when the students identify which taste as being most affected?

Sweet taste.

Explanation:

The instructor determines that teaching was successful when the students identify that sweet taste is the most affected with aging. As we get older is harder to distinguish different flavors because the number of taste buds decreases, causing a loss on taste, this especially affects the sweet taste.

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