3 month nutritionist

I am in the beginning process of this journey, I am required to meet with the nutritionist for 3 months and my BMI is currently at the qualifying range of 35.5. My question is if they put my on a meal plan for the next 3 months and my BMI falls below 35 will I be not eligible for bariatric surgery or do I need to try to keep my BMI at 35 during this 3 month process?