It's due to the easy access to food these days. We have readily available fast food everywhere we go, whether it's Maccas, KFC, pizza, chinese or even just the school/work canteen or vending machine. Then, at the grocery store, they sell ready-made processed food that we just put in the oven and it's ready. There's a lack of effort when it comes to food! There's also lollies, biscuits, cakes, etc. At work, many people also spend most of their day seated at a desk or doing little activity. Also, because we're so busy, we often don't have time to make time for exercise. Food is the main problem though. Most desk jobs have people snacking on biscuits and junk while they work as well. Too much food!