Httqm's Links
(...) taking frequent breaks is good for your productivity, focus, and creativity (...)

(...) the absence of a proper lunch break can actually lower productivity. (...) our brains have a limited pool of psychological energy.

(...) the 10% of employees with the highest productivity (...) didn’t even work full eight-hour days. What they did do was take regular breaks. Specifically, they took 17-minute breaks for every 52 minutes of work. (...) Those 17 minutes were spent completely away from the computer.

And in the comments :
I definitively believe that taking optimal breaks enhances productivity, but the timing is not always one-size-fits-all in my experience.
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