Stress and poor nutrition can all be to blame; when the brain is not receiving adequate ‘fuel’ it becomes low in energy which in turn causes memory loss, inability to learn and retain knowledge and a general lack of motivation. supplement the brain _Website not available. Sign in: https://www.twine.net/signup_…Stress and poor nutrition can all be to blame; when the brain is not receiving adequate ‘fuel’ it becomes low in energy which in turn causes memory loss, inability to learn and retain knowledge and a general lack of motivation. supplement the brain _Website not available. Sign in: https://www.twine.net/signup_WWWW…