Admitting that you have a food problem is the first step. Then you can find solutions. Most eating disorders start with restricting food or dieting. Read the Keys Study HERE. It is amazing what happened to the subjects. This study was done before most people knew that eating disorders existed.
Today scientist have found that cyclical bingeing and food deprivation (i.e. yo-yo dieting) actually changes the brain chemistry. There are also some foods that share the same neuropathways in the brain as alcohol or drugs. Some people are predisposed to crave foods that may lead to food addictions, eating disorders, and obesity.
These people develop food allergies and food addictions. If they have certain foods or drinks they start binging. The addicting substances most often seen are sugar, white flour, and fats. Fast foods have all three.
One easy way to find out if this is your problem is to record how you feel after eating fast foods. Pay close attention to craving more food, mood changes, and fatigue. This could be a clue. If this is your case you can decide to have fast foods knowing how you will feel later. Thinking it through, you may not want to experience the aftermath of a binge. Over time this becomes a no brainer.
Some people need help to sort this out. Many people with food addictions and/or eating disorders enter a treatment facility so they have a safe place to resolve the food issues and build a new foundation for healthy living.