There are 3 simple steps:
1) Download the iTunes app: https://itunes.apple.com/us/app/giveyourcalories/id598880646?ls=1&mt=8
2) Order/buy/make any food you fancy and take a photo of your food using the app
3) The app calculates the number of calories in your food and gives you the option to donate via PayPal (every 100 calories = $1)
Apologies to those of you (like myself) who do not yet own an iPhone, but this app does not seem to be on the Android market yet.
Help restore the world food balance by donating money for (at least some of) the calories you eat!