The researchers found that US per capita food waste has progressively increased by about 50% since 1974 reaching more than 1400 Calories per person per day or 150 trillion Calories per year. Previous calculations are likely to have underestimated food waste by as much as 25% in recent years.
This calculated progressive increase of food waste suggests that the US obesity epidemic may have been the result of a "push effect" of increased food availability and marketing with Americans being unable to match their food intake with the increased supply of cheap, readily available food.
Hall and colleagues suggest that addressing the oversupply of food energy in the US could help curb to the obesity epidemic as well as reduce food waste, which would have profound consequences for the environment and natural resources. For example, food waste is now estimated to account for more than one quarter of the total freshwater consumption and more than 300 million barrels of oil per year representing about 4% of the total US oil consumption.