No, healthy foods are not automatically sustainable. While some healthy foods can be grown and produced sustainably, others may not. Sustainability is a complex issue that takes into account several factors, including how food is produced, transported, and consumed. Just because a food is healthy does not mean that it is produced in a sustainable way. For example, certain types of fish may be healthy but may also be overfished, leading to environmental degradation. Similarly, certain fruits and vegetables may require large amounts of water and other resources, which can strain local ecosystems. Therefore, it is important to consider both the healthiness and sustainability of food choices when making decisions about what to eat.