This occurs when cocoa butter fats separate from cocoa, says Cassell.

Cassell 说，当可可脂与可可分离时，就会发生这种情况。

After all, Cassell says water itself has no ingredients that would make it go bad.

Cassell 说，毕竟水本身没有成分会让它变质。

The best practice is to refrigerate, handle and cook eggs properly, says Cassell.

Cassell 说，最好的做法就是冷藏，正确地处理鸡蛋。

As Cassell explains, drinking milk a day or two after the milk's sell-by date may not be a safety issue but be more of a taste issue.

Cassell 解释，在牛奶保质期后一两天喝牛奶造成的可能不是安全问题，而是口味问题。