The prospect of getting extra bang for their food buck has more people perusing
warehouse-style club stores like Costco and Sam’s Club. But the urge to stockpile large amounts of food in the house may lead to calorie overload.

A paper in the Journal of Marketing Research found that club store shoppers buy about 3,500 more calories a month—mostly nonperishable packaged foods—than they would if they didn’t shop at these outlets. And there is a good chance people who lug home extra calories are likely to eat many of them, which could have waistline repercussions. To resist the urge for a jumbo-sized container of chocolate-covered almonds, people should bring along a detailed shopping list and use club stores mainly for lower-calorie, healthier staples, like bags of frozen berries and whole grains.