A family of Microsoft word processing software products for creating web, email, and print documents.
If the line spacing of the Body Text style has not previously been modified, then a change in the line spacing of the Normal style should be applied automatically to text that is formatted with the Body Text style.
If however, the line spacing in the Body Text style had previously been changed from Single to 1.5 lines, and then the line spacing in the Normal Style was changed from Single to Double, that change will no longer be reflected in the definition of the Body Text style or in text to which that style has been applied.
If however, you modify the formatting of the Body Text style itself, then such modification should automatically be applied to text that is formatted with that style UNLESS that text has been modified by the use of direct formatting. If that has been done, you can get such text to be formatted with the Body Text style as modified by selecting it and then pressing CTRL+Q, which has the effect of removing any direct formatting so that the text returns to the format defined in the style.