Study: U.S. households waste nearly a third of their food


It’s not uncommon to hear farmers and ranchers talk about the stresses of feeding the world in the coming decades, as populations grow to almost unimaginable levels, while arable land and labor decline. But what if, in addition to growing more, society did a better job of using the food already available? Crazy thought, right? Jill Wheeler, Syngenta’s Head of Sustainable Productivity in North America, has stated in the past that she thinks we are already close to the production levels we need by 2050, but the industry is largely hindered by factors that affect distribution, as well as by waste.

And there’s a key: Waste. 

New research out of the College of Agricultural Sciences at Penn State and published in the American Journal of Agricultural Economics is putting a spotlight on that issue, saying that American households waste, on average, almost a third of the food they acquire. This wasted food, the economists say, has an estimated aggregate value of $240 billion annually. Divided among the nearly 128.6 million U.S. households, this waste could be costing the average household about $1,866 per year.

This inefficiency in the food economy has implications for health, food security, food marketing and climate change, noted Edward Jaenicke, professor of agricultural economics at Penn State.

“Our findings are consistent with previous studies, which have shown that 30 percent to 40 percent of the total food supply in the United States goes uneaten — and that means that resources used to produce the uneaten food, including land, energy, water and labor, are wasted as well,” Jaenicke said. “But this study is the first to identify and analyze the level of food waste for individual households, which has been nearly impossible to estimate because comprehensive, current data on uneaten food at the household level do not exist.”

The researchers overcame this limitation by borrowing methodology from the fields of production economics — which models the production function of transforming inputs into outputs — and nutritional science, by which a person’s height, weight, gender and age can be used to calculate metabolic energy requirements to maintain body weight.

In this novel approach, Jaenicke and Yang Yu, doctoral candidate in agricultural, environmental and regional economics, analyzed data primarily from 4,000 households that participated in the U.S. Department of Agriculture’s National Household Food Acquisition and Purchase Survey, known as FoodAPS. Food-acquisition data from this survey were treated as the “input.”

FoodAPS also collected biological measures of participants, enabling the researchers to apply formulas from nutritional science to determine basal metabolic rates and calculate the energy required for household members to maintain body weight, which is the “output.” The difference between the amount of food acquired and the amount needed to maintain body weight represents the production inefficiency in the model, which translates to uneaten, and therefore wasted, food.

“Based on our estimation, the average American household wastes 31.9 percent of the food it acquires,” Jaenicke said. “More than two-thirds of households in our study have food-waste estimates of between 20 percent and 50 percent. However, even the least wasteful household wastes 8.7 percent of the food it acquires.”

In addition, demographic data collected as part of the survey were used to analyze the differences in food waste among households with a variety of characteristics.

For example, households with higher income generate more waste, and those with healthier diets that include more perishable fruits and vegetables also waste more food, according to the researchers.

“It’s possible that programs encouraging healthy diets may unintentionally lead to more waste,” Jaenicke said. “That may be something to think about from a policy perspective — how can we fine-tune these programs to reduce potential waste.”

Household types associated with less food waste include those with greater food insecurity — especially those that participate in the federal SNAP food assistance program, previously known as “food stamps” — as well as those households with a larger number of members.

In addition, some grocery items are sold in sizes that may influence waste, he said.

“A household of two may not eat an entire head of cauliflower, so some could be wasted, whereas a larger household is more likely to eat all of it, perhaps at a single meal.”

Among other households with lower levels of waste are those who use a shopping list when visiting the supermarket and those who must travel farther to reach their primary grocery store.

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