I eat a lot of coconut oil and I have not gained from it. I lost fat - not weight, but fat from using coconut oil over a year without dieting at all. (belly fat)
From feb to april, I went thru a gallon (7 lbs) of coconut oil (don't know how I did this; I was not trying) I didn't gain and my tummy shrunk a bit.
Since I started with the coconut oil and gave up using vegetable and seed oils I am never sick and I feel better than I ever had.