The idea behind a superfood is that there are particular items that have profound medical powers over the human body e.g. Garlic reducing risk of cancer.
The problem is that some studies isolate the active ingredient of the food (the part that is supposedly reducing cancer risk) and give it to mice in large quantities.
In the case of garlic, it would mean you have to eat 28 cloves a day to get the same effect. And that would be in mice, not humans.
Sam Fitzpatrick Final Year Medical Student, Cardiff University.
Milad Rouf Final Year Medical Student, Cardiff University.
Nhs.uk. (2017). Superfoods: the evidence - NHS Choices. [online] Available at: https://www.nhs.uk/Livewell/Superfoods/Pages/superfoods.aspx [Accessed 16 Nov. 2017].