I think you just go back and unsubscribed to the thread or threads you no longer want to see emails from or have in your subscribed listing.
Yep, just visit your Subscribed Threads page http://hcgdietinfo.com/hcgdietforums/subscription.php and then click on the check box to the right of Notification in the blue bar above the threads you are subscribed to. This selects all the threads currently being shown on the page.
Then at the bottom click on the Selected Threads button at the bottom right and click on Delete Subscription.
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