Prevention of Coronary Heart Disease.

SIR,-Surgeon Captain T L Cleave and Dr W W Yellowlees (29 May, p 1340) both remain unaware of, or choose to, ignore, the fact that the fat of the intensively reared animals that they get from their butchers differs from that eaten by hunter-gatherers at the time of Moses and by nomadic peoples like the Masai today. My colleagues and I have described these differences,1-4 World Medicine has reviewed them,5 and we have written a general book on the subject6; the same query on animal fats was raised and answered in the Lancet five years ago.7