Your Health and Wealth Information is a tool. In a very small number of cases, the mere fact that information is held may confer power upon the possessor. In most cases, as with other commodities, the power and the wealth arises from the use to which the commodity is put.
Information is a more malleable commodity than coal, iron or any other physical product.
Although swords may be beaten into ploughshares, the process is a difficult one and involves destruction of the original object. The uses to which information can be put are limited only by the imagination of its possessor and the same raw material may be used for an infinite number of purposes. In most cases, it may be assumed optimistically, the interests of the holder and the subject of personal data will coincide. What makes the attainment of any effective system of control difficult is the fact that the most mundane item of information may be used to the detriment of the subject, the most sensitive item to their benefit. Context is all important.