It is difficult to predict with certainty what will happen to Omar's weight on this diet, as it depends on various factors such as his current weight, body composition, and overall health status. However, it is important to note that fad diets centered around a single food or food group may not be sustainable in the long-term and may not provide all the necessary nutrients for good health. Additionally, rapid weight loss through extreme calorie restriction may lead to loss of muscle mass and a slower metabolism, making it more difficult to maintain the weight loss. Therefore, it is possible that Omar may lose weight initially, but may also gain it back once he returns to his regular eating habits. It is always recommended to consult with a healthcare professional before starting any new diet or weight loss program.