This is one reason why some people grow up to believe that they will never amount to anything in life, because they have been told as children that they wouldn't.
Some examples with food and CLA Safflower Oil eating are that "saturated fat is bad for you" or that "fat goes straight to your arteries and blocks them up". Another famous one is the Calorie myth. Which goes something like: "Energy in must equal energy out, and if you want to lose weight then it is as simple as eating less calories than you are expending, then you will lose weight" Those of you who have been dieting for many years on this basis, know that this does not work in practice. You may lose the weight to start with, but with one diet after the other it gets harder and harder.
Zoe Harcombe did extensive research into this, particularly around the idea that 3500 calories = a pound of fat and she asked numerous agencies including the NHS, BDA (British Dietetic Association) NICE and the National Obesity Forum in the UK where this idea came from and whether they could find the scientific source? None of them could give an accurate answer. In her book she sets forth a challenge and requests an answer from anyone who may have it. As far as I know she has not yet received one. You can read this for yourself in her book "The Obesity Epidemic", Chapter 7.