Everyone thinks they eat good food.
Food is the number one physical measurable input into our bodies. So it boggles my mind that nutrition isn't the most studied subject, alongside maybe the study of living a fulfilling life.
Changing my eating habits has changed my life for the better. It took kidney stones (not recommended) to get me here. But even my most obese and unhealthy friends like to proudly tell me the "healthy" things their eating, and I don't have the heart or patience to try to tell them anymore.
But if you find what works for your body, food becomes more of a tool for living your best life, and something you'll defend to protect yourself and to continue living that good life, which makes the right choices so much easier.
Now maybe that's not what you need to hear, but I know it's definitely true for some other people that are going to see this.