Diet myth 3: A low carb diet flushes calories from the body.
Diet facts: Many people believe the body can excrete fat fragments (called ketones) in urine while on a low carb diet, essentially flushing calories out. But a study at Virginia Polytechnic Institute and State University in Blacksburg found no correlation between urinary ketone levels and weight change in women on a low carb diet.
Cutting carbs restricts so many foods that are normally accompanied by fat, that dieters often end up slashing calories overall. The initial rapid weight loss they experience is caused by the body draining glycogen stores for energy. With each gram of glycogen used, 3 grams of water are released, with the result being almost immediate weight loss due to increased urination. After about 10 to14 days, increased urination ends and so does the rapid weight-loss phase.