A lemon water detox diet, sometimes known as a "master cleanse" diet, serves no health-related purpose, according to Healthline. No scientific evidence exists to back claims that this diet is healthy, and negative side effects could include fatigue and lack of energy.
A lemon water detox diet is not healthy and is likely to produce loss of muscle mass and nutritional deficiencies. In addition, weight lost through this diet is likely to be temporary. The diet also is difficult to follow and can result in headaches, cravings and hunger, as WebMD explains. Losing weight gradually by eating foods that include needed nutrients is a healthier way to diet.