點解飲凍飲會覺得冇熱飲咁甜?

這是因為味蕾(taste bud)會隨著溫度升高而增加對甜味的敏感度。

至於為甚麼味蕾有這特性，由於科學界對人體的感覺的研究還是在起步階段，科學上暫時還未有一個公認的最終解釋。

以下是引述自一個比較近期的實驗結果：

...Human taste buds - microscopic channels in our tongue called TRPM5 - are highly sensitive to changes in temperature. At 15°C these channels are hardly open whereas at 37°C, their sensitivity is 100 times greater.

So the warmer the food or drink in your mouth, the stronger the electrical signal that TRPM5 will send to your brain....

becuz' of the coldness affect the sensitivity of your taste buds. u know they kinda... freeze. i dunno wt exactly the principle is but it is based on sth like that.