You can eat acorns, but they are not safe to eat raw due to their high tannin content. Tannins are bitter compounds that can be toxic in large amounts and reduce your body's ability to absorb nutrients. To safely eat acorns, the tannins must be removed by a preparation process such as soaking or boiling the shelled nuts repeatedly until the water runs clear and no longer tastes bitter. Once leached of tannins, acorns can be roasted and eaten as a nutritious snack, or ground into flour for baking. Eating properly prepared acorns is safe and can provide fiber, antioxidants, and nutrients like iron and manganese. However, eating raw or unprepared acorns can cause nausea, constipation, and potential liver or kidney damage in high amounts. Additionally, people with tree nut allergies should avoid acorns. So, yes, you can eat acorns, but only after proper preparation to remove tannins.