5 Things You're Doing Wrong at the Grocery Store

What he found: When we asked Wansink, who's been analyzing people's shopping habits since 1995, what surprised him the most, he told us that he's constantly amazed by how flexible shoppers are. We all go into the store with certain healthy items in mind, and we all walk out with fattening stuff we don't really need. We're so much more susceptible to cues like advertising, sampling and packaging than we realize, he says.

What you should do: Use these cues to your advantage. Wansink says he found that people who take an apple from home and eat it on the way to the store end up subconsciously priming themselves to buy healthy food.