A Question of Calories?

I'm amazed at something I've discovered about how my body works: If/when I eat what my body needs, my weight is stable. If I don't, it's not.

I know that for me, for now, my ideal diet is extremely high in fat, mainly from animal sources, with vegetables & greens, and no carbohydrates except the lactose in my goat milk or raw milk (I'm even feeling like the lactose is a compromise so that my body can get the nutrients from the milk, because cream and raw milk cheese appeal to me much more than the milk, but goat's milk or raw cow's milk are good when I don't have cream or cheese available).

My breakfast this morning consisted of a quart of grass-fed cream, 2 pieces of coconut cake (basically coconut flour, coconut milk, coconut oil and eggs), and 8 slices of uncured bacon. Total calories? 3,923 according to www.nutritiondata.com

I have no idea how many calories I will have consumed by the end of the day. I have not been running like I planned to, so I am not burning off big amounts of calories through exercise. In contrast, I gained 10 pounds in 10 days when I added occasional grain and fruit to my diet last month, and I didn't have any significant increase in the total amount of food I was eating during that time. As soon as I stopped eating carbohydrates, I stopped gaining weight. My one "cheat" has been having some beans in soup or chili at a couple of family parties, which has added about three more pounds.