Sub Demo()
Application.ScreenUpdating = False
Dim Rng As Range
With ActiveDocument.Range
  With .Find
    .ClearFormatting
    .Replacement.ClearFormatting
    .Text = "Nutrition"
    .Replacement.Text = ""
    .Forward = True
    .Format = True
    .Style = "Heading 4"
    .Wrap = wdFindStop
    .MatchCase = True
    .MatchWholeWord = False
    .MatchWildcards = False
    .MatchSoundsLike = False
    .MatchAllWordForms = False
    .Execute
  End With
  Do While .Find.Found
    Set Rng = .Duplicate
    Set Rng = Rng.GoTo(What:=wdGoToBookmark, Name:="\HeadingLevel")
    Rng.Delete
    .Collapse wdCollapseEnd
    .Find.Execute
  Loop
End With
Application.ScreenUpdating = True
End Sub