Washington — Just as millions head to tanning beds to prepare for spring break, the Food and Drug Administration will be debating how to toughen warnings that those sunlamps pose a cancer risk.

Yes, sunburns are particularly dangerous. But there’s increasing scientific consensus that there’s no such thing as a safe tan, either.

Going back for a second dessert after your holiday meal might not be the best strategy for living a long, cancer-free life say researchers from the University of Alabama at Birmingham. That’s because they’ve shown exactly how restricted calorie diets — specifically in the form of restricted glucose — help human cells live longer.