Can anyone do something intentionally?

Consider someone is doing something (for instance eating). I can say that he is eating because of hunger, and his hunger is because his body needs energy. So, **every** action have **external** causes **only**. Can I do something by my own (without **external** causes)? I know that I can't do unwholesome things because of anatta. But I can say that I did something because of ignorance, and also that my action has an effect (karma). This post may not be a question. I'm looking for a way to clear my understanding. Kind regards.