Once I started learning about organic, whole foods eating, I felt this guilt when I would eat something unhealthy. It has taken a long time to get over this. There is no condemnation for those who are in Christ. We can make wise choices without putting healthy eating on the altar. The goal is for we sheep to listen to the voice of our Shepherd. He will never speak guilt into our lives. We are free from guilt. He speaks words of life, gently urging us to follow him in all things.
Keep an eye out for panic, distress, guilt, discouragement, or seeking to control others. These things are not from the Shepherd. I have felt all of them at some point, so know that we are in this together! In this tough transition period, you may not have the ingredients to make a healthy snack or haven't found a dessert you like yet. That's okay! Or, maybe you would just like to have a candy bar tonight and are not sensing that you would be disobeying Jesus by doing so. That's okay!
This is not just about food but about self-control that comes through grace - not trying to receive God's favor by being self-controlled! The focus is on God's worthiness, not ours! Hang in there, friends!