You cannot equate obesity and gluttony. They are not the same. A person can be unwillingly obese without being a glutton, and one can be a glutton without being obese. One is a physical condition, and the other a spiritual one.
Almost all people who are obese are obese because they indulge in eating to excess and/or drinking to excess combined with lack of activity - period.
Gluttony not laziness to blame for obesity
Again, this is subject that very few people wish to approach with honesty.
Even some doctors and medical professionals will throw out nonsense PC claptrap regarding obesity, saying that while the primary causes are over eating and lack of activity, factors such as "culture, and socioeconomic status are to blame."
As Ravi Zacharias once said (paraphrasing here), if culture is allowed as an excuse to water down sin, then truth and morality are robbed of their very essence.