I don’t want to take credit for someone elses information but here is a useful link explaining the difference between body fat and food fat.
The crux of the article is a Kilogramme of body fat is 7,700 calories but a kilo of pure food fat is 9,000 calories. Any oil fits the latter category even if is a good one.
This is how the discrepancy as I see it occurs, burn 7,700 calories and loose a pound of unpure body fat. Eat 1 kg of pure fat and gain 1.25 kg. No one has ever explained it to me like that and I stand to be corrected.
I know about the 9,000 calories a litre of oil contain and that is why I avoid crisps like the plague. ( crisps 30% fat) Don’t get back to me saying Walkers crisps are healthy mono fats and good for you fats, they are still high in calories per gramme which ever way you look at it.
Ever see a vending machine with an apple or orange in it?
So from a weight loss point of view I see it as more effective to limit your intake of fats, eat healthily, do some exercise and loose weight naturally.
Linking this to my recent posts on what it takes to burn off a Mars Bar it makes sense to cut out those fats.