According to a recent article, rats that ate a high fat diet during pregnancy cause their daughters and grand-daughters to be subject to an increased risk of contracting breast cancer. The implications are that during pregnancy, women should concentrate on a well balanced diet, complete with supplementation of vitamins and minerals. Those that eat too much fat can actually increase cancer risks for generations to come. The interesting thing to note is that the mother rat's son's daughters were at equal risk!
Now pregnant mothers, don't run out and stop eating fats completely. They are essential for the formation of many parts of the body, in particular they form protective layers around nerves and are found in high concentrations in the brain.
The best oils and fats are from deep water fish, virgin olive oil, and flax seed oil, to name a few. The important thing to remember is that YOU SHOULD NOT HEAT THESE OILS! When they are heated, they change and become oils and fats that are not healthy for you (this is easily seen by comparing the viscosity of oil when it has cooled after being used for frying to the viscosity of oil before cooking). Good oils are used as supplements or for flavor on vegetables, salads, etc.
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