Some low fat and low carb manufactured food is actually very high in calories. Whole foods that are in the state that they are in when they come off the tree are naturally low in fat and usually calorie also. The only things that I can think of that are whole and not low fat are avocados, coconuts and nuts. There has been much talk recently about good fats and bad fats and I don't really understand how that fits in with a low fat plan. Salmon (which I love) is a fish that isn't low in fat but it is the "good" fat so I do try to limit my intake of it.
BTW, Brian, your pictures are VERY impressive! You look like you have lost an amazing amount of weight! Congrats!!!