In line 01, the author says “Probiotics and prebiotics are a...

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Probiotics and Prebiotics: What’s Really Important


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(Available at: https://www.health.harvard.edu/nutrition/are-you-getting-essential-nutrients-from-your-diet/ - text especially adapted for this test).

In line 01, the author says “Probiotics and prebiotics are a hot topic these days”. What does “hot topic” mean in this context? 
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