I totally agree. Aristotle is still relevant today. But regarding happiness, as presented in this article, all these philosophers, Aristotle included, offer behavioral recipies that the SELF must enforce on his body in order to be happy. Usually by enforcing such things as frugality and fasting, instead of letting the body do what it wants. So let the body decide what is best for itself.
But what I want to say is that, happiness is, to a great extent, a feeling resulting from, or caused by, some chemicals. Like melatonin and seratonin. So all we have to do is to create the right conditions for the body to secrete the optimum amount of happiness chemicals. So it seems happiness is not about forcing body to behave a certain way.