The Stubborn Fat Solution”. Who is This For? The Stubborn Fat Solution is aimed at men who are already at 10-12% body fat and women who are at 15-17% body fat and want to go even lower. It isn’t designed for people who need to lose a lot of weight. This book is aimed at people who are already pretty darn lean and who want to get extremely lean and defined. This would be the ideal diet for someone who had an upcoming photo shoot, or a lead actor or actress in an upcoming movie role, etc. Make no mistake about it…this is for those of us who want to look absolutely outstanding.