https://www.carbmanager.com/article/xtqrmbeaacaacffo/how-to-blast-through-weight-loss-stalls-keto/
fat-burning mode isn’t like flipping a switch. When you go Keto, your body needs time to fat-adapt.
Without Keto, your body relies more on carbs (glucose) for energy. But a low-carb diet takes away your carbs, so you switch to burning fat for energy. This fat-adaptation, also called Keto-adaptation, can take anywhere from 2 to 8 weeks, depending on the state of your metabolism.[*]
So if you’re on the Keto diet to lose weight, you need to be patient. That’s the first principle. Being patient gives your body time to fat-adapt, so you start burning through your body fat for energy.