These data can then be used in  2/5  BIS - Central bankers' speeches  insurance, but also for banking services. And it's not just health data, of course. Many different types of data are increasingly used and useful. Think of data on energy consumption, or payments data. All these can help inform credit risks on loans.
At low interest rates, the user cost of capital is lower and business people would be more inclined to invest their money in risky but probably lucrative capital projects. In this way the fixed investment ratio of the country would be increased, leading to higher growth and more employment opportunities.