a waste of time? really? what does that mean? does this mean the difference between 10-20 pounds over the course of 10 years? because that's the vast majority of 'weight' concerns - people who are overweight but not obese are 'otherwise healthy' but if we can put a finger on exactly what causes people to put on a few pounds it would be a significant advance in science that would affect billions of people.
like, how can you possibly say that investigating what causes a "increased psychological urge to eat" is some kind of trivial pursuit? that's the whole problem with "otherwise healthy" people.