Walnuts are not easy to digest when eaten too much. Old people should take a small amount of walnuts. Children can eat walnuts, two or three a day.
Pregnant women may eat 20 walnuts a day for a healthy baby, which is unhealthy and difficult to digest! Eat 1 to 2 walnuts or 3-4 pecans every day, and just use less oil when cooking.