@NoOne phil,
It seems as though in the title of the post there are two conflicting words used i.e. obesity and gluttony. Obesity is assigned to a state, a condition that an individual is in, as a result of a certain action or series of actions. Gluttony regards the simple action (although mind you it is in the form of a noun or adjective). Let us consult a dictionary for further clarification:
(glŭt'n-ē)
n.
pl.
Excess in eating or drinking.
(ō-bē'sĭ-tē)
n. The condition of being obese; increased body weight caused by excessive accumulation of fat.
Now although these definitions do not hold any sort of weighted complexity, they are more than suitable for the discussion at hand. The question is: Is the state or the action immoral? And thereby we need to understand whether the state or action is immoral. Or both.
Now when we look at the word obesity, we do not see the actions leading up to it, but merely the state the individual is in i.e. a state of obesity. What gluttony regards is not the state per se a person is in but also the actions by which the individual partakes in i.e. excess in eating or drinking (and also sexing if you wish to broaden the scope of gluttony, which is completely acceptable). Gluttony does not check the state a person is in at a given time but merely the actions (excessive eating, drinking, sexing) that a person partakes in when being gluttonous. A person could very well be a very skinny, fit, individual but at the same time may be involved in one form of gluttony or another.
Now keep in mind that I left out the word "healthy" when I look at a gluttonous person. Generally speaking, gluttony leads to some form of health problem(s). Too much drinking (binge drinking) can lead to liver problems; too much cocaine or drugs can lead to a person whose brain is blown out like an overused engine; and too much eating can lead to obesity or an assortment of other problems.
In regards to the word obesity though, we do not know per se how the person became obese. It could very well be that the person has cancer and a giant malignant tumor has grown on the persons body to over two hundred pounds, person is genetically prone to gain weight i.e. slow metabolism, thyroid problems, &c. &c. We can assume however, based on cause and effect, that a person is obese solely because of gluttony and nothing else.
I hope I have made the distinction clear on to the functions of the words stated in the thread title so we can hopefully moves this thing along with a solid correctness.