This study tested the hypotheses that : a ) body composition , inflammation and vascular function would improve with a high fat diet ( HFD ) when type of fat is balanced as 1/3 SFA , 1/3 MUFA and 1/3 PUFA ; and b ) body composition , inflammation and vascular function would improve more when balanced HFD is supplemented with 18C fatty acids , in proportion to the degree of 18C unsaturation .