What is the ruling on eating beef and lamb fat in Islam, and is it forbidden by Islamic law because it is harmful, as one female preacher mentioned?

Allah forbade the fats of sheep and cattle to the Jews because of their transgression and injustice, as stated in His Almightyقول (saying): "And of the cattle and sheep We forbade to them their fat, except what is carried on their backs or entrails or what is mixed with bone. That is how We recompensed them for their injustice, and indeed, We are truthful." As for this nation, Allah has permitted to them fats and all other parts of cattle and sheep. It is necessary to caution anyone who forbids what Allah has permitted.