Thats been my mantra for years. I have forever told any child in my house:
"Of course I eat butter, why would I eat plastic."
And "full fat milk is 96% fat free, why skim of the best bit? Its because they can sell it separately for more, not for your health."
I dont think spreads are quite as bad as plastic these days but in the UK "I cannot believe its not butter" is horrible.... I can, you would have no taste buds at all if your thought that.