I think you're getting mixed up.
Transfats should be avoided.
Saturated fats are needed by the body.
- For calcium to be effectively incorporated into the skeletal structure, at least 50% of the dietary fats should be saturated.
- Saturated fatty acids constitute at least half of the cell membranes. They are what gives our cells necessary stiffness and integrity.
- Fats also act as enzyme and hormone regulators, and are the base material out of which the body makes cholesterol, which is the precursor to such critical hormones as vitamin D, cortisol, testosterone, estrogen and progesterone, as well as bile acids which are necessary for the digestion of fats.
- Fats also are needed as carriers for the fat soluble vitamins (the antioxidant vitamins), like vitamin A, E, D, K, and a low fat diet can lead to deficiencies in these nutrients.
As with most things, moderation is the key, rather than excess or omitting foods or macro-nutrients from the diet.