Is it true that orange juice can help ward off colds? How does age affect our immune system? Is mental health really connected to inflammation?We are surrounded by bold claims and quick fixes for ‘boosting’ our immune health. But one thing the science is clear on is that everyone’s immune system is completely unique – what is good for one person may not work well for another. So how do we separate the bogus claims from the useful advice? And given its sheer complexity, is the...