Try this bedtime tonic: two tablespoons of vinegar with a late-night snack. Doing that may help reduce fasting blood glucose levels the following morning, notably in people with type 2 diabetes, says research at Arizona State University.

This study used apple cider vinegar, but expert Jennie Brand-Miller at the University of Sydney says it works with any vinegar (balsamic, red wine, white wine, even lemon or lime juice) and in non-diabetics. Acidity, she says, seems to "put the brakes on stomach emptying," slowing the digestion of carbs. Perhaps this explains why vinegar may dampen appetite, she adds.

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