Sleep Deprivation and Unexpected Weight Gain: New Study Says Skipping Hours Adds Pounds

Ever wonder why the scale seems to creep upward even though you haven’t changed what you eat? A fresh study from Columbia University Irving Medical Center suggests the culprit might be something you do every night – or rather, don’t do.

Researchers recruited 95 adults who already carried a higher risk for heart or metabolic disease. Over a twelve‑week period, participants first enjoyed “adequate” sleep – roughly seven to nine hours – and then, for the next six weeks, were asked to shave off about 90 minutes each night.

At the end of that sleep‑restricted stretch, the group had, on average, put on roughly one pound. It wasn’t a dramatic jump, but the extra weight was accompanied by a modest increase in waist circumference and a tendency to sit a bit longer during the day. Their reported moderate‑to‑vigorous exercise stayed about the same.

Interestingly, the study didn’t spot clear changes in body‑fat percentage or muscle mass, and participants weren’t asked to track their food intake. That leaves a little mystery about whether the extra calories came from late‑night snacking, hormonal shifts, or simply the body’s altered energy use when it’s short‑changed on rest.

Dr. Somi Javaid, an Ohio‑based OB‑GYN who wasn’t involved in the research, says the findings line up with what we already know about sleep and metabolism. “Chronic short sleep is not a lifestyle quirk,” she told Fox News Digital. “We need to treat sleep as a vital sign of health.” She added that women navigating menopause might feel the impact even more, as sleep disturbances become common at that stage.

The American Heart Association has recently upgraded sleep to one of its “Life’s Essential 8” metrics, recommending adults aim for seven to nine hours per night. The Columbia study reinforces that message, showing that even a modest, consistent loss of sleep can tip the scales—literally.

That said, the researchers caution against over‑interpreting the results. Six weeks is a relatively short window for body‑fat changes to emerge, and the sample size, while decent, limits deep subgroup analyses. Hormone measurements were taken only in the morning, which may miss fluctuations that happen later in the day.

Bottom line? If you’re counting calories or logging workouts but still feel a few pounds slipping on, consider adding a bit more shut‑eye to the equation. Sleep isn’t just a nightly pause; it’s an active player in how our bodies manage weight and heart health.