Article: How tired can you get? (effects of starvation, sleep loss and exhaustion on immune system)

Starvation diets and extreme exercise can kill your immune system.

As the days stretch out, many of us who had trouble shaking our winter lethargy are now perking up considerably. The increased daily exposure to light even makes some of us a little manic - a biological turn-around that's certainly more productive than hibernal stupor.

Sometimes the mild mania that arrives with spring can give birth to dangerous ideas, though - like your plan to lose your seasonally acquired corpulence by next weekend. If you've decided to undertake a slimming regimen, or are simply running yourself ragged with a brutal work schedule, there are some new findings about sleep, ...

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