Enter your salad and weight-
friendly dressing, the vinaigrette. A medley of olive oil and vinegar, seasoned as you please and moderately portioned, is the best way to complement your greens. It's tasty, and what's more, new research from Japan suggests that ordinary household vinegar turns on genes that help fight fat.
Scientists put mice on a high-fat diet, and only some were given regular doses of acetic acid, the main chemical in vinegar. The mice who received the vinegar compound developed up to 10 percent less body fat than the mice who didn't receive it. Scientists believe that the acetic acid helps the body break down fats, which prevents fat buildup and weight gain.