The researchers found that healthier diet patterns—for example, diets rich in fruits, vegetables, fish, and nuts—cost significantly more than unhealthy diets (for example, those rich in processed foods, meats, and refined grains). On average, a day’s worth of the most healthy diet patterns cost about $1.50 more per day than the least healthy ones.

The researchers suggested that unhealthy diets may cost less because food policies have focused on the production of “inexpensive, high volume” commodities, which has led to “a complex network of farming, storage, transportation, processing, manufacturing, and marketing capabilities that favor sales of highly processed food products for maximal industry profit.”

via Eating healthy vs. unhealthy diet costs about $1.50 more per day.