For the last two weeks I've been conducting a little experiment on myself. I've always held the belief that 'calories in vs. calories out' is the deciding point in fat loss. Anyway, lately I've been reading about the idea of insulin being the main cause of fat gain, and the belief that if you maintain low insulin levels, you will not gain weight despite a large caloric intake.
Two weeks ago I weighed 135lbs. I am 5'4". I have just had a tattoo so my only exercise has been walking (around 5 miles a day). My usual caloric intake is around 1500-2000 calories, with around 80g carbs, 100g protein and the rest from fat. For these two weeks, I have not exceeded 15g of carbs on any day (and have often been under 10g). I have consumed around 100g of protein.
So that's around 460 calories from carbs and protein. The interesting point is this: my average caloric intake over these past two weeks has been around 4000 calories a day. That's around 400g of fat, every day. It sounds pretty insane, I know. I've been consuming copious amounts of cream and cheese, coconut oil and butter. Yesterday for example, I drank two pots of cream for breakfast (2,670 calories, 282g fat). That probably sounds gross to a lot of you! Anyway, so two weeks of eating like this and the result is that I've gained...nothing. No weight. I am still 135lbs. Actually, I think I may have lost a bit of fat as my jeans are a little loose.
This is a pretty extreme example, and I wouldn't really recommend eating like this (the thought of another slice of butter makes me want to hurl right now...all I want is a nice big salad...) but it's interesting that, as somebody who has struggled with carb addiction and terrible insuling sensitivity, I have been able to maintain my weight despite eating a huge number of calories. Take from it what you will!