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We've all heard the usual explanations for Americans' expanding waistlines – everything from too many carbs to too little exercise. But might hardware stores and hair salons also be responsible? The idea isn't as farfetched as it may seem.

Virtually everywhere we go these days – pharmacies, bookstores, banks, airports, auto repair shops – there's food. And much of it is in the form of high-calorie snacks like sodas, candy, cookies, muffins, frozen sweets, and chips, all of which can be hard to resist.

A new study, published in the American Journal of Public Health, provides startling evidence of just how ubiquitous these temptations are. The researchers sent volunteers to visit more than 1000 retail stores in 19 U.S. cities. They found that snack foods were available in 41 percent of businesses, often close to the cash register.

Some of the stores were places you'd expect to find food, such as pharmacies and gas stations. But many others were not. More than one in five furniture stores sold snacks, as did 16 percent of clothing stores, 54 percent of car dealerships, and 55 percent of home and garden stores.

Let's assume you're exposed twice per week to these temptations and succumb just 10 percent of the time, buying a typical snack containing 250 calories. The researchers calculated that this would add up to 2600 extra calories a year. Keep doing this for several years, and before you know it, you're packing on pounds.

As this video shows, the more accessible that snack foods are, the more we tend to eat. Unfortunately, steering completely clear of them isn't an option (unless you're willing never to leave your house). One solution is to become more mindful of what and how much we're eating and to think twice before we buy. If that big muffin at the bookstore is beckoning you, try counting to ten and asking yourself "am I really sure I want to eat this?" Often the answer will be no, and you can summon the willpower to skip the snack.

It's also a good idea to carry healthful, lower-calorie snacks with you. That way, when the sight of an oversized cookie gives you the urge to eat, you can grab an apple or a handful of nuts. And by not blowing money on snacks in the store, you'll have a little more to spend on what you came to buy in the first place.

As H1N1 flu marches across college campuses this fall, students are hearing a simple message about how to protect themselves: Wash your hands. But getting them to comply may be far more complicated.

During an infectious disease outbreak at a Canadian university in 2006, researchers found that students frequently failed to clean their hands before going into the cafeteria--even though there was a hand sanitizer and poster by the door instructing them not to enter unless they washed up. According to the study, which appears in the current issue of the Journal of Environmental Health, 83% of the students said they practiced proper hand hygiene. Yet they actually did so less than 20% of the time.

The researchers say one problem is that the "wash your hands" messages posted on campus weren't compelling enough. So how do you get students' attention? Gross them out. At least that's what another study on hand-washing found. As this video shows, when messages such as, "You just peed, wash your hands," were posted in bathrooms at the University of Denver, hand-washing rates went up.

This kind of in-your-face approach isn't limited to hygiene messages. It's also being used in Great Britain to warn kids about the dangers of texting while driving. Police in Wales have produced a gory video, which has become a YouTube sensation, showing a deadly accident caused by a teen texter.

Health officials in New York City are also trying to shock people--
in this case adults -- with posters on subways. A picture shows disgusting globs of fat pouring from a soda bottle, along with the message "Don't drink yourself fat." The campaign, which will run through the fall, aims to get people to cut back on soda and other sugary beverages.

Not all health educators agree that provoking shock and disgust is an effective way to change behavior. But if the result is that even a few more students wash their hands or put away their cell phones in the car, it's worth the effort. At the very least, it makes those health messages a lot more entertaining.