Health

Send questions about the office, money, careers and work-life balance to workfriend@nytimes.com. Include your name and location, even if you want them withheld. Letters may be edited. Nancy (With the Lying Face) I have a perfect storm of mental and physical defects. I cannot keep my emotions off my face. …

There’s a lot to learn when you first go keto, so I figured hey, why not put all the info in one place? Without further ado, here are my responses to the questions I get asked most often. What is keto in the fewest words possible? “Keto” is any diet …

To stave off obesity, we might want to both stride and lift, according to an important, large-scale new study of how different types of exercise affect the incidence of obesity in America. The study, which involved health records for almost 1.7 million men and women, indicates that people who exercise …

For today’s edition of Dear Mark, I’m answering four questions from readers. First, what does an “increased risk of mortality” actually mean if everyone’s going to die in the end? Second, what makes fish heads so delicious and nutritious? Third, what is the relationship between metformin and exercise? And finally, …

Eric Brown and his wife, Stacey, were stunned to learn that Stacey was pregnant again and even more surprised that not one — not two — but three more babies were on the way. “They were naturally conceived, so this was a complete and total surprise,” said Mr. Brown, 37, …

Your co-worker shuffles in at around 9:45 a.m., eyes averted, and makes a beeline for the coffee pot. Although your colleague may not verbalize his current state of mind, his mug — “Don’t talk to me until I’ve had my coffee and then after that still please don’t talk to …

High levels of Vitamin B12 may be too much of a good thing. Vitamin B12 is an essential nutrient, important in nerve and blood cell health, and most people obtain enough of it in food. Those with B12 deficiency, or an inability to absorb it, can use supplements. But a …

ESSEX, Mont. — The long freight trains climb slowly over Marias Pass, through snow-draped mountains south of Glacier National Park and north of the Great Bear Wilderness, snaking through some of the wildest country in the Lower 48. Some 25 trains a day, each a chain of 90 to 120 …

One of the purported benefits of a keto diet is that it will help tame unwanted sugar cravings. On the surface, it makes sense. If you want to get rid of sugar cravings, stop including a bunch of sugar in your diet. Out of sight, out of mind. Or does …