Weight loss can occur on this diet, but only because it's low in calories. We would all benefit from eating fewer high-sugar foods, which are not allowed in this plan. Scientific research does not support a link between insulin and weight gain. Diets low in carbohydrates can cause fatigue and nutrient deficiency. This plan can be low in calcium and fiber and high in saturated fat, which can raise blood cholesterol levels.
Weight loss can also be due to fluid loss secondary to a low carbohydrate intake.
Yet another plan villainizing carbohydrates, the body's preferred form of fuel. Please read it.