Getty Images Cold temperatures, however, diminish TRPM5 channels, “which makes iced coffee popular for those who are sensitive to coffee’s natural bitterness and acidity,” she added.

The debate over hot vs. iced coffee is one you've likely engaged in — with friends, coworkers, on social media or even in your own head as you've approached the line of your favorite java ...

Since iced coffee is made with hot coffee that’s been brewed over a short period of time, “it is better for preserving the beans’ original flavor profiles and complexity,” he says.

Starbucks changed its iced coffee blend and recipe for the first time in 18 years. The change comes after customer orders were evaluated.