When you want to sweeten yogurt or oatmeal, skip the agave. "Agave is extremely high in fructose, which has been linked with an increased risk of cardiovascular disease and belly fat," Turner says. White, brown, and raw sugar all spike blood sugar and add empty calories. So what to use? "For my money, stevia is the best buy," says Turner. This all-natural sweetener made from a South American plant has no calories, no sugar, and no carbs. "It's been proven safe by hundreds of clinical trials and has been used for thousands of years," says Turner. Stevia is already used in bottled drinks like Sobe Lifewater O and is sold in individual packages or bulk form near the sugar at many supermarkets and natural foods stores.