$1:
They calculate that a fatter population needs 19 per cent more food energy for its energy requirements. The production of that extra food requires machinery that emits greenhouse gases, as well as transport systems that emit pollution.
I stopped reading after this...
The only answer I have to this is: BS!!
People eat what they need (or more, and get fat, or less and die of anorexia), and people who work out 7 times a week, 2 hours a day, eat lots. They have to. Just stick to a healthy diet, and let McD's go bankrupt.
I don't work out, I don't eat much, and have a superhealthy BMI of 22.6
So there!