From heart-friendly margarines to sugary cereals that strengthen bones, once-demonized foods are being spiked with nutrients to give them a healthier glow — and consumers are biting, even on some that are little more than dressed-up junk food.   A report released Thursday finds that even in a weak economy, people will pay a premium for products seen as preventing a health problem or providing a good alternative to sodas and empty-calorie snacks.
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