Pay attention to your diet right now. It's the core of a healthy lifestyle. You love anything tuna: melts, casseroles, sushi. But, it's full of mercury. So how much is safe to eat? Albacore has three times as much of the heavy metal as light tuna. For a 150-pound person (if you're pregnant or nursing avoid it altogether) allot yourself a half can of albacore or two and a half cans of light tuna a week. C