A new study has found that drinking matcha, a type of green tea, may improve perception of emotions and sleep quality in older adults with a decline of cognitive functions. The study, conducted by researchers from Japan and published in the journal Alzheimer’s & Dementia, is the first long-term clinical trial to test the effect of matcha on psychological functions. The causes of dementia are numerous, and studies have suggested that nutrition plays a key role. Matcha is a popular beverage particularly in Japan and contains ingredients such as theanine, which has been suggested to improve short...