Once men have a goal they can't focus on anything else, driven by a single thing that nothing was going to get in their way of. Some think they need a large house with a pool and a massive backyard, and all their focus is spent on obtaining it. All their effort goes towards reaching it, not realizing the consequences of their single-mindedness.
All their time and energy is spent on moving up their company, getting bigger and bigger paychecks, more money for their pockets and their future. They don't realize they've stopped caring about their bodies, never getting exercise, just eating and letting the pounds pile on. They don't care as they slowly grow out of their chair and shirts. As long as they're making progress to their goal, their bodies grow huge and fat.
They finally reach their goals after several years, after a decade of letting their bodies go. All their constant work and neglect as laid waste to their figures, turned into useless sacks of lard. Their habit has turned them into big lazy men with nothing else to do, only indulge in their reward and continue to grow.