Another interesting area of study is the gut microbiome which can influence health and psychological well-being in a lot of ways. The most interesting aspect that I have seen in scientific/medical TV programmes and articles is that the microbiome can be changed to a more beneficial balance. One of the ways to do that is by using prebiotics and/or probiotics, resistant starch (assuming that resistant starch does not create problems as mentioned by Jack Campin), eating healthy fibre etc but also for extreme cases by performing "transpoosions", i.e. faecal transplants.

Back in school, I never really knew what I wanted to be when I grew up but as I have progressed through my interesting and varied careers I often think that if I had known about nutritional science and medicine I could have happily followed that path.

Jack, I love green bananas. I can't imagine life without them but as I said to Mrrzy early in this thread, it can be a life-changing nutritional revelation when you find out what triggers a physical or psychological reaction because you then know what foods to avoid or to choose.