The latest health news from around the world, as well as tips and information to help you improve your health and wellbeing. Many methods to improve your health are pretty straightforward: to lose weight, eat less and exercise more; to boost your energy, get more sleep; to prevent dehydration, drink more water. Others, however, are totally counterintuitive. The following tips really do work—but they may leave you scratching your head. Don't brush your teeth immediately after meals and drinks, especially if they were acidic. Acidic foods—citrus fruits, sports drinks, tomatoes, soda (both diet and regular)—can soften tooth enamel "like wet sandstone," says Howard R. Gamble, immediate past president of the Academy of General Dentistry. Brushing your teeth at this stage can speed up acid's effect on your enamel and erode the layer underneath. Gamble suggests waiting 30 to 60 minutes before brushing. Muscle weight, that is. If two women both weigh 150 pounds and only one lifts weights, the lifter will more likely fit into a smaller pant size than her sedentary counterpart. Likewise, a 150-pound woman who lifts weights could very well wear the same size as a 140-pound woman who doesn't exercise. The reason: Although a pound of fat weighs the same as a pound of muscle, muscle takes up less space, says Mark Nutting, fitness director of SACO Sport & Fitness in Saco, Maine. "You can get bigger muscles and get smaller overall if you lose the fat," he says. "The bulk so many women fear only occurs if you don't lose fat and develop muscle on top of it." Cut back on calories and add weight to your workout to lose inches.