I just got started testing Google Bard, so I fed this question to it and got this reply:

No, humans cannot eat wood. Wood is made of cellulose, which is a type of fiber that is not digestible by humans. If you eat wood, it will pass through your digestive system without being absorbed. In some cases, eating wood can cause blockages in the digestive tract, which can be dangerous.

There are some animals that can eat wood, such as termites and beavers. These animals have special enzymes that help them to digest cellulose. Humans do not have these enzymes, so we cannot eat wood without getting sick.