Fat loss is not linear, and there are often periods when it slows, or our weight even goes up. A complicating factor is that people who have restricted their calories in the past often find on a ketogenic diet that they add muscle and bone mass, even while losing fat, and this of course confuses things if your only metric is your scale weight. How are your clothes fitting, these days? If they are looser than they were, then you are doing things right. And if they keep getting looser, then you are definitely making progress, regardless of what your scale is telling you.
Another factor is that fat loss slows down as we approach our ideal weight. The stories of spectacular fat loss are from people who had a great deal to lose. Even those people, once they began to approach a healthier weight, found their rate of fat loss slowing.
Another possible issue is that our notion of what is an ideal weight is not necessarily in agreement with our body’s notion. I’d be very happy with losing another sixty to eighty pounds, but since my primary goal was to reverse my diabetes—which has totally happened—I don’t actually care that I’m not as thin as I was forty years ago, especially since I lost enough weight to be able to climb stairs, etc., without pain and struggle. It’s all a question of what we are trying to achieve.
If fat loss is your primary goal, first consider whether your apparent slowdown might be the effect of adding lean mass. That is not a bad thing. On the other hand, if you really feel you need to lose more fat, first take a look at how much carbohydrate you are really eating. Double-check your food labels to make sure they haven’t changed the product formula, that sort of thing. Be brutally honest about how much vegetables you are getting, and so forth. Also make sure you are eating enough, because if you are restricting your calories, you might be putting your metabolism in famine mode. The way to be sure you are getting enough is to eat to satiety: in other words, eat only when hungry, stop eating when no longer hungry, and don’t eat again until hungry again. Most people who eat this way find themselves naturally limiting their eating to one or two meals a day, because they simply aren’t hungry, and this pattern of eating has the added benefit of prolonging the amount of time during the day that their insulin level is low. A high insulin level is the way the body tells itself to store fat, so keeping insulin low for as much of the day as possible is an important part of this way of eating. It’s also why fat is an important part of a well-formulated ketogenic diet: fat is the one food source that barely triggers an insulin response, so it is a safe source of calories.