This food will allow you to increase your health and maximum health, as well as giving you a quick passive buff to increase your abilities, which will vary depending on the type of spectral food you eat. The buff type of each spectral meal will appear in the lower left corner of the screen. It could have several benefits in one meal, and in this case you can consume them one after another to maintain the passive.
These foods can be found around town and can be purchased from in-game markets using Meika.
If you want to increase the number of consumables you'll be carrying, including Spectral Food, you'll need to head to the Team Skills menu.
That's all you need to know about how to use Spectral Food in Ghostwire Tokyo, so now that we've reached the end, we hope you can get as much out of this food as possible.