Hello @danielle
Independent third party lifestyle apps may be promoted within branded apps if they do not contradict copy within the brands TMA. PAAB would ask to see the app content to ensure the link is acceptable.
The review of linked 3rd party apps focused on lifestyle and nutrition vs lifestyle, nutrition and disease information is not different however there is increased opportunity for content which is not acceptable to arise when disease information is discussed.
Additional clarification would be required on the last question that would be better suited for an opinion submission so that all aspects of the activity can be assessed. For example, is the 3rd party app only accessible through the PSP (not open to the public)? When this is the case, clarity over influence, sponsorship and distribution may impact if the content requires PAAB review.