public NodeState AmIHungry() {
	if(...) return NodeState.Success;
	else return NodeState.Failure;
}

public NodeState DoIHaveFood() {
	if(...) return NodeState.Success;
	else return NodeState.Failure;
}

public NodeState EatFood() {
	// do something to reduce food
	FunctionToReduceFood();
	// then check if this action is success, fail or running
	if(...) return NodeState.Running;
	else if(...) return NodeState.Success;
	else return NodeState.Failure;
}