Behaviour is triggered and controlled subconsciously without us even realising it. Trying to think about our condition logically and rationally rarely achieves anything because the unconscious part of our mind is so incredibly powerful that it will almost always over-ride any remedial action we try. Only by retuning the unconscious can progress against obesity ever be made.
Being overweight is not simply one-sided and negative. It has a function and a purpose. You may feel bad about your weight, but importantly can you see a new meaning in your weight? Can you give yourself a chance to figure out what all of your extra eating is about? Can you see any benefits to having extra weight, or have you anxieties around letting go of weight or food?
There is nothing new about our love of fat and sugar. We have a strong evolutionary drive to eat these foods because they are rich sources of calories which can be laid down as fat - which is simply stored energy. Our ancestors needed plenty of fat to fuel activity during periods of food scarcity and to pay for our large, expensive brains.
Exercise more, eat (and drink) fewer calories. It's a simple message, but hard to do. In fact, the more we learn about obesity, the more we realise how complex the problem is and why hammering home this message on its own doesn't get you very far, if you're trying to help people lose weight or prevent them becoming overweight in the first place.
We give companies the ability to advertise harmful foods to children in a misleading way. We make healthier food more expensive and harder to come by. We create living environments not conducive to active lives. We then chastise the obese for not exercising their personal choice as if they made that choice in a vacuum.