'Took over the world by storm' implies that the popularity of these health trends spread like fire.
In the field of English linguistics, idioms can be described as phrases that give a figurative meaning rather that the actual meaning of the words being used. The usage of idioms in a sentence adds beauty to a sentence.
'Took over the world by storm is one such idiom that means that something spread rapidly, just like a fire. It means that the popularity of a certain action becomes common within no time.
In the sentence above, the idiom indicates that some health trends became so common in a rapid manner. They were being used by the majority of people in a short span of time.
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