
Rapid weight gain from eating foods rich in saturated fats quickly increased bad cholesterol levels, even in otherwise healthy and normal-weight adults in their mid-20s. The opposite was true in those who ate products made with polyunsaturated fats, even though they gained equal weight in the same amount of time.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/J_Xtp1IPrTg/141015165244.htm