After the government made it mandatory for supermarkets to show the nutritional value of their products, production of certain products were stopped, as consumers made better choices. I feel the same can be done with products with massive food miles, if the carbon emission was included in the wheel. Above is a rough idea of what it would look like. I included it in the nutrition wheel, as the environment's health is as important as our health.
This would take effect on a larger scale, and in return, the country as a WHOLE will make better choices