Reusable water bottles
You have to account for the energy used to make said bottle as well as the emissions associated with transporting said bottle to the store.
Shop locally to decrease the fuel consumption of transportation–shop at farmer’s markets, CSAs, food co-ops, and markets that sell local products.
Eat less meats
Meat is the most resource-intensive food on the plate. It takes much more energy, water and resources to produce a pound of meat, than a pound of grain or produce.
Eat more wild caught fish
Most fish farms are close to or abutting the shoreline and causing erosion in shorelines. Farmed fish can also absorb PCBs and dioxins, as the near-shore waters they occupy are the first stop for run-off from land-based sources of pollution.
Buy organic produce
Organic foods have dramatically fewer energy-consuming pesticides and fertilizers than standard produce.
Buy produce that is in season
Eat seasonally, which essentially means that you are eating locally, which means that you are not supporting the fuel consumption of cross-country, cross-global transportation.
Eat more fresh and less processed
Any foods that come in any type of packaging, by de facto, requires more energy to produce. Plus, when you consume foods with additives and other chemicals, you also have to account for the energy required to make them.