Are there safe chestnuts for humans to eat?

Yes, there are safe chestnuts for humans to eat, specifically the edible sweet chestnut (Castanea sativa) and the American chestnut (Castanea dentata). These varieties can be roasted, boiled, or used in various dishes. However, it's important to avoid horse chestnuts (Aesculus hippocastanum), which are toxic to humans and can cause serious illness. Always ensure you're consuming the right type of chestnut.