Yes, it's very important to eat clean whole organic foods that are not processed.
Eating one-ingredient foods such as avocado, apples, organic chicken, organic eggs, etc are great and you can base your entire day- all your meals and snacks around these foods. No need to eat processed foods that are lurking with sugar and inflammatory ingredients that often cause headaches, fatigue and digestive issues.
I have a ton of clean recipes in my cookbook, Eating Clean: The 21-Day Plan to Detox, Fight Inflammation, and Reset Your Body as well as on my website TheHealthyApple.com that anyone can eat and enjoy. Hope that helps!