Salmon: Why? Omega-3, baby! The fatty acid is great for your immune system and also combats depression. Try it in a pasta dish like this one for a double hit of happy. CRANBERRIES: Why? Ever had a urinary tract infection? Ouch, right? These little berries help to keep your bladder healthy and prevent the dreaded cystitis. Try dried cranberries daily on your morning cereal. Dark Chocolate: Why? Do you need a reason? It’s chocolate! The 80 - 90% cocoa kind boosts natural serotonin, so if you feel blue in the afternoon, nibble on a square of the dark magic to pep you up. OYSTERS: Why? You either love them or hate them, but they’re the sexiest ocean food. Oysters improve dopamine levels, which boosts libido in women and men, and after a few laps round the bedroom who could be in a bad mood? Shiitake mushrooms: Why? These Asian relatives to the regular mushroom are packed full of vitamin B, in particular B6, which is packed full of serotonin and melatonin that helps you regulate your sleep patterns. And we all know sleep = happy.