hormones. But when a heavy training schedule puts pressure on your immune system, you can ensure that you make healthy diet choices.The key to maintaining an efficient and effective immune system is to consume enough of the nutrients that play a vital role

as supplying the working muscles and vital internal organs (such as the liver) with nutrients in order to maintain energy levels, is also used to cool you down.Warmer blood is drawn closer to the skin so that excess heat can radiate from the surface

adapting to a regular (or increasing) training load. Long runs, hard sessions and races also leave your immune system dramatically lowered, so knowing what to eat, drink and do immediately after exercise is vital for staying fit and healthy too.Keep Moving

not ovulating, the presence of a period does not guarantee a healthy menstrual cycle. A lack of ovulation can signal insufficient levels of progesterone, which can lead to over-stimulation of the uterine lining, putting you at risk of endometrial cancer. If you

The myth: To lose weight, cut carbs or fatThe truth: Most get-thin-fast plans revolve around the idea that restricting your intake of one particular nutrient, usually carbs or fat, is the best way to lose weight. But the results of a 2009 New

and vegetables will provide the right mix of nutrients for your training.Ready to run again?It's near impossible to outline a one-size-fits-all recovery programme for such a unique problem. But a sensible approach is to take a couple of weeks of complete rest

problem scenario for our central nervous system which is trying to prevent our bodies from running out of the energy and nutrients it needs - and making sure our heart and brain has enough glycogen to keep operating. When it senses that we are pushing our

temperature above 101°F could increase the risk of birth defects. So make sure you’re staying cool enough, and if in doubt, take your temperature after a run. If it’s over 100°F, you’re probably overdoing it. Also, skip that post-run soak in a hot bath.6. You

 about your exercise programme – is essential to guarantee a healthy pregnancy. A supportive doctor who recognises the benefits of an exercise programme will not only listen to your concerns, but should also address your individual needs, although you should never hesitate

shortfall in nutrients, especially carbohydrates. Ironically, feeling dizzy can even be a sign that you’re over-hydrated. "This isn't nearly as common as dehydration," says Dr Lewis Maharam, medical director of the New York City Marathon, "but it can strike