A review.Concerns over the effects of dietary trans fatty acids have prompted refiners and packers to re-examine the relative merits of the fat modification processes which are practiced on a com. scale.Starting from the overall objectives for new product development, Part 2 of this paper will review with 2 references 2 methods of fat modification, namely interesterification and biomodification.Hydrogenation and fractionation were discussed in Part 1 of this paper in the Mar. 1998 issue of Lipid Technol.