Research is showing that incorporating wood and other natural materials into our buildings can reduce stress and contribute to good mental health. Bringing nature indoors through exposed wood and other natural materials can have a positive impact on our health. …Exposure to wood is correlated with a drop in cortisol, the primary hormone linked to negative impacts of stress. Similar studies (PDF) observed lower levels of blood pressure and heart rate in an environment where wood is present, compared with one where it is absent. And in one study, participants’  focus, and concentration improved when asked to perform a task in a room featuring exposed wood surfaces. Bold expressive wood structures can play a big role in biophilic design. …Expansive use of exposed mass timber to construct roofs, walls and floors can help do just that, while offering aesthetic, structural and environmental benefits. Similarly, the addition of wood finishings, fixtures and furnishings can also have a favourable effect.