Studies like these convince me that the lipid profile of those following a LCHF becomes different than those following other eating approaches. The question is whether the increase in FFAs is actually unhealthy or simply an indication of the dynamics found in those when fat becomes the primary fuel. Certainly lots more to understand about this, but the knee-jerk reaction to a higher lipid profile is not necessarily an indictment for heart or health risk due to diet. Once again, it's the situation where the increased presence of fat doesn't mean that fat is the root cause of any disease, similar to the presence of firefighters at a fire.