impossibility or incorrigibility?

I'm somewhat amused when I read the perspective, "Merely eating less and exercising more is an approach to weight loss whose effectiveness has been disproved innumerable times throughout recorded history." While I agree that it's ridiculous to think that a person of any shape can target any weight they wish, surely it's beyond doubt that weight is affected by habits of eating and physical activity? Practically speaking, people come naturally in all sizes, but each person has the final decision on how to adjust those two "levers". Someone with the same inborn body range as me could be heavier or lighter than me, via the multitude of choices.

Some cultures put excessive emphasis on weight. Like the stars on the Dr. Seuss "sneetches", it's an easily identifiable distinction for sorting individuals by superiority. Cultural taboos and attitudes are quite variable. People who would be acceptable in one society could be scorned in a second. No sensible or universal rationale is necessary for the shaky "morals" of appearance and behavior that are invented by capricious earthly judges.

As Christians who follow God's laws, we think differently. In this case, we recognize the plain sin of gluttony, but we also acknowledge that conspicuous sins are often less deadly to the spiritual life than unseen or subtle sins. A greedy dependence on food may attract more stigma than a greedy dependence on money. Regardless, Christians shall forbid either in order to be free from enslavement to any created thing.

And when we repent of gluttony or the worship of Mammon, we live in faith of the possibility of change. We don't scoff at the idea of self-discipline. Instead we comply with the metaphorical crucifixion of our sinful leanings. Rather than contemplating and wrestling with temptation, we do something simpler: we deny it less than a toehold in our thoughts. The path to committing a sin of action or omission starts by committing the sin mentally within one's fantasies or mental plans.

Cynics are accurate in their observations of the failures of the unspiritual person to achieve personal transformation through weak natural willpower. Flesh demands fleshly actions. In contrast, Christians exercise their godly focus in practice. They release their hungers to Him, and they're revitalized to reject sin in general, including the unspiritual person's fixation on gluttony.