Just as I notice the BBC telling us that Junk food is bad for your metal health I also notice that these guys are telling us about foods that boost your mood.

Whatever way you look at at the word is that what you eat can and does impact on how you feel.

By introducing variety into your diet you not only increase the ammount of good stuff but crowd out the bad. There is a huge amount of good stuff and a fairly limited range of bad when you start to look at it.