Ketogenic diets often create a significant loss of water during the first phases. This is because carbs are converted to glycogen in your body, which is stored in water within the muscles and liver. As you deplete stored glycogen, your body flushes this water out. This is a huge part of the initial weight loss during the first few weeks of ketosis. While rapid fat loss does occur at first, a lot of water weight is often dropped as well, but this is a great encouragement as it often results in both weight loss and less bloating, allowing clothes to fit better.
'Studies have shown that compared to energy-restricted diets (ie cutting down on overall calories in a day), low-carb diets may be more effective for weight loss in the short term,' says Dr Barclay. 'This is partly due to decreases in body glycogen stores (in the liver and muscles), and the associated water loss that occurs (which collectively weighs about 2kg in a typical adult).'
For a snack that needs zero preparation, reach for the olive jar, Griffin suggests. Olives are mostly made up of fat, specifically healthy monounsaturated fat, Berkley Wellness points out. Plus, as research published in the Journal of Agricultural and Food Chemistry notes, they're loaded with antioxidants, and are low in calories and carbs. Keep in mind that olives can contain a lot of sodium, though — sometimes as much as 42 milligrams in one olive, according to Berkley Wellness.
A systematic review in 2018 looked at sixteen studies on the ketogenic diet in adults. It concluded that the treatment was becoming more popular for that group of patients, that the efficacy in adults was similar to children, the side effects relatively mild. However, many patients gave up with the diet, for various reasons, and the quality of evidence inferior to studies on children. Health issues include high levels of low-density lipoprotein (LDL), high total cholesterol, and weight loss.
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.