Ask How would I create a nutrition journal section with WordPress membership site?

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I want to add a nutrition journal section to my WordPress membership site. I want members to log their daily meals and track their progress. I have no idea how to set this up. Should I use a plugin, or do I need custom coding? I also want it to be private so only members can see their own entries. It should be easy to use and mobile-friendly. I don't have much technical knowledge, so a simple solution would be great.

How can I create a nutrition journal section for my membership site?