Offering some sort of telephone support is a requirement to be able to sell the product from the manufacturer. However, they don't require that you be a qualified dietitian. One of the reasons I would recommend Medifast first is that you have constant access to registered dietitians and staff who are qualified to answer medical questions. Unfortunately, most of us that battle weight problems also have a whole host of other medical problems that can be affected by the diets we choose to follow. When following a vLCD such as these, the chance of needing professional help is higher.
I'm not saying NLD is bad, I'm just saying it's not the same thing as Medifast. The product is different, and the support is different. It may be a good option for a lot of people. But it's not the same thing, and Medifast would be a better option in my opinion