Adding vinegar to a meal slows the glycemic response—the rate at which carbohydrates are absorbed into the bloodstream—by 20%. Reason: The acetic acid in vinegar seems to slow the emptying of the stomach, which reduces risk for hyperglycemia (high blood sugar), a risk factor for heart disease, and helps people with type 2 diabetes manage their condition. Ways to add vinegar to meals: Use malt vinegar on thick-cut oven fries…marinate sliced tomatoes and onions in red-wine ­vinegar before adding the vegetables to a sandwich…mix two parts red wine vinegar with one part olive oil, and use two tablespoons on a green salad.