I agree with the above, its not rocket science.
Problem with the Hong Kong working culture, limited living space (much less a kitchen), eating out for a quick lunch or dinner (which is often not the healthiest) is the viable choice
Many HKer need the carb (rice, noodles), so spending $80-$100 on a healthy salad seems preposterous (I think so too!)
That is exactly where the issue is - heavy processed carbs, cooked with unhealthy seed oil, less than freshest ingredients
And on weekends, they go out and splurge on more unhealthy food and cakes, heavy sugar again