Can other MyFitnessPal users view the updates that are posted to my news feed?
By default, ONLY your MyFitnessPal friends can see any activity on your news feed. Anyone who is not your friend cannot see any of your activity. The only small exception is that, if a friend comments on someone’s status, you’ll be able to see that one status item only, even if you are not friends with them. But the rest of their activity will remain private. In general, your activity will only be shared with the people that you trust and want to support you. If you don’t want someone to see your activity, just remove them from your friends list, or don’t add them in the first place – it’s that easy.