Under the FSA use it or lose it rule, money left in a health flexible spending account when the plan year ends is generally forfeited. Your employer may soften that with a grace period of up to 2½ months or a...

You may need more vitamin D from food or a supplement in winter, especially if you live in the northern half of the country. A classic study found that winter sun in Boston makes no vitamin D in skin from...

So you signed up. Or you’re about to. Maybe a coworker talked you into it. Maybe the race shirt came in a nice color. Maybe you watched a marathon on TV and thought, “Sure, but shorter.”...