Yes, it's correct, but the writer should have used a hyphen between all and natural . Five All-Natural Ways to Stop Feeling Depressed It means that the methods are completely natural. Your suggestion means that there are only five natural ways to fight depression.
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HUBLOTIsn't All Five Natural Ways correct?No. This says there are five ways which are natural ways, and the article is going to talk about all five of them without leaving out any of the five in the discussion.