Do you often feel exhausted and negative? Do you spend your days feeling tired and wired? Your nights unable to fall asleep easily, or without a drink? Do you wake up anxious and stressed and in need a coffee to get going? Do you forget what you were doing, forget people's names and where you put things? Is your mental acuity and memory slipping? Are you concerned about your memory or mental wellbeing?

Something depressing is happen to humanity, and possibly even you. Our brains are degenerating and - in parallel - we're seeing a worrying increase in mental illness across the world. Rates of anxiety, depression, dementia, ADHD and autism are all increasing at an alarming rate across the globe. According to the World Health Organisation, our declining brain health is the greatest threat we face - more than cancer, diabetes or obesity.

Individually and collectively,though, we can optimise our brain health and cognitive function - to improve mood, memory, stress resilience, sleep and ability to focus. How? By understanding the powerful effects that nutrition and other holistic lifestyle factors can have on our brains. In Upgrade Your Brain, bestselling author Patrick Holford will draw on his 40 years' of expertise - as well as countless experts from around the world - to teach us all how to reverse the tide.