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Netherlands

Swallow more herring

The Dutch down about 85 million of these slippery fish per year—raw. That's about five for every person in the country (and five more than eaten here). They're pickled, then served unadorned as snacks or in soft buns with onions and gherkins for lunch.

Oily fish like herring is slimming for a few reasons, says Dr. Pescatore, author of The Hamptons Diet. It contains lots of omega-3 fatty acids, which reduce levels of the stress hormone cortisol—and cortisol is known to increase the amount of fat deposited around your middle.

What's more, lunching on herring or canned sardines guarantees you'll ingest far fewer calories than you would if you eat a burger or even fish sticks. Just don't forget the breath mints.