Many food products are claiming to be high in this 'good' bacteria and some of the best types are homemade fermented food like miso soup, yoghurt and sauerkraut. This really makes me think twice about what I eat – maybe I should change my diet to perk me up! Doctor Michael Mosley would agree. He's been looking into this for the BBC and says the best food to cheer us up is in a "Mediterranean diet. Olive oil; oily fish, full of omega 3, which is really good for the brain; whole grains; lots of fruits and vegetables. Sugar: terrible for you!"

So maybe it's time to lay off the fatty and sugary things. Eating healthily may seem simple, even if the science behind it is complex. It's not rocket science but this is further evidence for the saying 'we are what we eat' – the person we are is determined by the food we eat. There are other factors that can change our mood but it seems we have some ability to improve how we feel by controlling what we put on our plate. Does your diet affect your mood?

词汇表 pleasurable 令人愉快的

belly 肚子，腹部

a smile on one’s face 某人面带微笑

sweet tooth 爱吃甜食，对甜食喜爱

pick-me-up 使人兴奋的饮品或食品

dietician 营养师

diabetes 糖尿病

mental state 精神状态

depression 抑郁，沮丧

bacteria 细菌（bacterium 的复数）

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