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"Obesity comes down to eating too much and not being active enough, a psychologist said."

That caption for the article is really as simple as it is. If you consume more calories then you burn off, you'll gain weight.

I would also go as far to say that the majority of people who consume the supposedly recommend 2000-2500 calories per day are nowhere near active enough to burn that many calories. If you live a sedentary lifestyle you could be fine with 1000 calories per day. Grazing all day long on high-carb/low-fat food and not eating big meals (or eating out) also goes a long way in keeping your weight down.

The lack of self control some people seem to have is the most important factor. You DO NOT need to eat every time you feel a tinge of hunger in order to survive or have a healthy life. In all seriousness, severely obese people could easily survive an entire month drinking only water and taking vitamins (granted don't do this, because it could cause health problems) before having a real need for more calories.

This of course is from my point of view as someone who has never been overweight. I'm a 5'11" male, slim frame, not particularly active, don't really work-out much, eat whatever I want which usually ends up totaling ~1000 calories per day on average, and my weight fluctuates around 135lbs (the bottom end of a healthy BMI for my height). It really isn't all that hard. With all the low fat, low calorie foods in the supermarkets nowadays (even those not marketed at being so), I have no clue how people are even able to eat 2000+ calories per day without eating out.