September 17, 2020 4 min read Opinions expressed by Entrepreneur contributors are their own. In business, the return on investment (ROI) for your money is valued in terms of the ratio between your net profit and the cost of investment.  A financial analyst quickly calculates this value which generally reflects success, failure and or progress on the part of an entrepreneur or investor.  The ROI for health and well-being, for entrepreneurs, investors and us all alike, is not as easily calculable. There is plenty of research in health and medicine that discusses how to improve health, regain health and sustain good health. A clear takeaway from the research on gratitude is that gratitude…