Hunger is one way to know if you’re in fat burning, because the longer you do keto, the less hungry you’ll be.39,40 If you’re getting severe hunger with weakness and brain fog, you’re not quite into keto. Back off a bit. Don’t be doing 20-hour fasts. You need more fuel to give your body the energy it needs, and that includes energy to manufacture the enzymes to burn fat instead of glucose. Take it slow, add more fat to your first meal, and eat nutrient-dense foods. If you need more nutrients, try adding some nutritional yeast and electrolytes, and major amounts of potassium. These will help you fix insulin resistance and help you get into fat burning. Bone broth is great for a snack. It’s just nutrients without calories, period.
Our bodies are incredibly adaptive to what you put into it – when you overload it with fats and take away carbohydrates, it will begin to burn ketones as the primary energy source. Optimal ketone levels offer many health, weight loss, physical and mental performance benefits.1There are scientifically-backed studies that show the advantage of a low-carb, ketogenic diet over a low-fat diet. One meta-analysis of low-carbohydrate diets showed a large advantage in weight loss. The New England Journal of Medicine study resulted in almost double the weight loss in a long-term study on ketone inducing diets.