You are basically starving yourself and that comes with huge health risks.
The main issue with the diet is that it’s being referred to as a 'cleanse' on social media. This language is so misleading as ‘cleanse’ or ‘detox’ are completely meaningless terms. They have a positive feel to them and have a health halo but actually it’s a complete myth. A healthy balanced diet is called a healthy balanced diet because it is healthy and balanced. This is neither. Nutritionist and eating disorder specialists agree that the "water fasting" diet is fundamentally synonymous with starvation. Given such an unhealthy relationship with food, starvation dieters are likely to end up gaining weight in the long run. Everyone knows that. This is because when you deny the body the calories it needs, your metabolism slows in an effort to conserve caloric fuel and may be disturbed despite regaining normal eating habits. Ultimately, these kind of diets will lead to severe nutritional deficiencies and possibly a loss of skeletal muscle. Do whatever you think is good for you, just putting in my opinion.