This isn't the same control need that we find with Scorpio, who needs to control other people. This is a private need for control over themselves and their own eating habits.
Control is a sixth house theme, but because it is their moon found here, these people are also looking for emotional comfort from their sixth house. Food can definitely satisfy this need. I have seen this need run the full gamut from people who study nutrition and eat only foods that they have learned to be the absolute best, to people who couldn't care less about nutrition, but they will only eat food that tastes delicious. Delicious, unhealthy food does a great job of satisfying their moon. But healthy food can also satisfy their moon's need for emotional comfort by giving them the secure feeling of having cared for their bodies. Healthy or unhealthy, as long as they can eat what they want, the way they want to eat it, they are satisfied.