In the life sciences and chemistry fields it is important to be aware that a perceived lack of data in a patent application can have an impact on the eventual scope of protection available. Chris Bond of Forresters explains that is often necessary to decide how much data to include in a patent application in support of the claimed utility, for example, a biological activity; too much data there shows an effect at the edges of a broad claim; too little is likely to make the claim vulnerable to attack under inventive step.
https://international-pharma.com/wp-content/uploads/2014/12/How-much-data.pdf