The likely explanation is that there is a competition between the omega 6 and omega 3 PUFA in the body. Because of the increased susceptibility of omega 3 PUFA to oxidation, the use of oils or margarines rich in these PUFA is not recommended for frying foods. This lipoprotein oxidation may be enhanced by polyunsaturated fatty acids which are prone to oxidation. There is no evidence that monounsaturated fats increase this oxidation process. Since all vegetable foods lack cholesterol, signs on avocados claiming them to be cholesterol-free are nonsense.
Nuts are also rich in fat however the fats found in nuts are mostly mono- or polyunsaturated.
The best advice is to reduce the amount of saturated fat in the diet. This is not a complete listing of all foods containing saturated fat, but it does illustrate that past advice which mainly focussed on reducing the intake of red meat and dairy products will not reduce the saturated fat content of diets which contain some of the foods listed in this table. The table will serve as a guide to allow choices of different foods each day, thus contributing to a balanced diet. In summary, preventative advice on dietary fat is as follows. These foods might be a major source of saturated fat in a persons diet.