What makes you think that it isn't safe? I guess the other question is what makes you sure that another diet is safe?
Also would encourage you to read up on recent literature about fats. The "low fat = healthy" fad hasn't held up for some time.
https://www.sciencedirect.com/science/article/pii/S073510972...
> The recommendation to limit dietary saturated fatty acid (SFA) intake has persisted despite mounting evidence to the contrary. Most recent meta-analyses of randomized trials and observational studies found no beneficial effects of reducing SFA intake on cardiovascular disease (CVD) and total mortality, and instead found protective effects against stroke.