In a blog post about adopting healthier eating habits, the author states that choosing whole foods over processed foods is crucial for long-term health. The author provides examples of whole foods, such as fruits, vegetables, and whole grains, and explains that these foods offer more nutrients compared to their processed counterparts. The post emphasizes that making small, gradual changes in diet can lead to sustainable health benefits.
Based on this explanation, what is the main argument the author is making?