One common term used is 'comfort eating', which broadly describes food that allows us to relax as our metabolism slows down, and we in turn, feel more relaxed.
Scientifically speaking, it is in fact, fatty fish that are high in omega-3s, like salmon and mackerel that can help reduce anxiety. Other research suggests that we must eat eggs and in particular egg yolks that are high in vitamin D, which can also raise our mood.
The main idea, though, is to eat unprocessed foods that will reduce cortisol levels and thus reduce the inflammation in your body. The following foods have been suggested to help in this way: bananas, avocados, dark chocolate, broccoli, spinach, and pumpkin seeds.
If you are feeling the need to relax, then explore the recipes on this page and you are sure to find many that appeal.