FORTUNE -- Lunching al desko again today? You've got lots of company. Only 21% of people now regularly leave their workstations for a midday meal, according to a poll of 1,023 U.S. employees by talent development consultants Right Management.
These days, "far fewer employees are feeling comfortable enough with their work loads to take time away" for a quick bite, notes Michael Haid, a senior vice president at the firm.
Haid adds that many companies' cultures make people feel they need to apologize for stepping away from the grindstone even for 30 minutes. "One has to ask if such pressure, without any let-up, actually benefits the individual or the organization," Haid says. "I mean, does it really improve performance? We are definitely not talking about a return to the days of the three-martini lunch, but have we gone too far in the other direction?"
He thinks so. Employees fearful of being seen as slackers "begin to sacrifice their own break times in order to keep up with their workloads. So, whether the organization is imposing unrealistic workloads or whether employees are progressively giving up their own break times, leaders need to pay close attention and understand the early warning signs" of burnout, Haid says.
Tony Schwartz, head of New York City-based productivity consulting firm The Energy Project, says more and more companies are starting to recognize the problem. "What's at risk, when employees are overworked and stressed out, is their capacity to do great work," he says. The Energy Project's clients -- including Bristol Myers Squibb (BMY), Apple (AAPL), PwC, Google (GOOG), Sony (SNE), Ford (F), and Ernst & Young -- "see a clear link between exhausted employees and poor performance. Avoiding burning people out is critical to success, both for companies and for individual bosses."
A big part of keeping burnout at bay: Encouraging employees to take a break now and then. "When demand in our lives intensifies, we tend to hunker down and push harder," Schwartz observes. "The trouble is that, without any downtime to refresh and recharge, we're less efficient, make more mistakes, and get less engaged with what we're doing."
The paradox here, he says, is that "by pushing people too hard, you actually make them less productive. But if employees learn to manage their energy better," partly by taking short respites from work throughout the day, "they get far more done, and add much more value, in far less time." More
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