Losing central fat (belly fat) is one of the many benefits of a well-formulated ketogenic diet. However, where we store fat and where we lose fat in one area compared to other areas on our body is partially dependent on genetics. Another factor in our appearance after weight loss is how quickly our abdominal muscles shorten following the loss of internal (aka visceral) fat. For example, if you lose 6 inches off your waist, your abdominal muscles will need to shorten by a few inches. This is not done by contracting—they actually need to get physically shorter at rest, and this takes 6–12 months to occur by natural processes. In the meantime, your belly looks soft.
Bottom line: it takes a bit of patience to lose fat and then see the full benefits that we expect.