There has been much hand-wringing over the dangers of medical residents' grueling schedules. Doctors-in-training often forgo sleep entirely, racking up as many as 30 work hours in a single stretch.

If the case against cola/soda drinks wasn't already bad enough, evidence is increasing to suggest that excessive cola consumption can also lead to hypokalaemia, in which the blood potassium levels fall, causing an adverse effect on vital muscle functions."

Jet lag is a mismatch between your body's night/day clock and a new day/night cycle in another time zone. Symptoms of jet lag include fatigue, insomnia and restlessness, reduced appetite, constipation, and poor physical coordination and cognitive skills. The severity of your jet lag depends on which direction you flew in and the number of time zones crossed. Getting used to a new time zone typically takes one day for every time zone crossed westward or 1.5 days for every time zone crossed eastward.

Travelling westward lengthens your day, whereas eastward travel shortens the day. If you're travelling west, researchers suggest, go to sleep one hour later and wake one hour later than usual for the three days prior to travelling. Travelling westward is easier, as the body hasn't lost any hours and can more easily recover.

Eastward travel is harder on your body because it has to shorten its cycle to take into account reduced day time (so people travelling east find it harder to get to sleep at night). When travelling east, you should go to sleep one hour earlier and wake one hour earlier than usual for the three days before travelling.

Interestingly, phototherapy, or ‘intentional exposure or avoidance to bright light before you fly’ doesn't appear to work at all.

Water is a key ingredient in keeping your body's internal systems in balance. Dehydration over a long period can have immediate and long lasting effects including: tiredness, constipation, and poor skin quality. While advice differs as to how much water we should actually drink, most people should be consuming no less than 2 litres each and every day!

Incidental Exercise is exercise that occurs through the act of just going about your daily business. You can easily increase this element of your training by adding simple routines to your day. An example is 'taking the long route to the photocopier'. Simple changes like this can easily add 5-10% to your daily calorie burn!

Worried about tea staining your teeth? Tea Tonic organic tea have released Berry-Green Tea which they claim helps prevent new stains on teeth. They claim the berry component acts as a natural whitener, while also giving you a double shot of antioxidants.

Never do your weekly shopping on an empty stomach. Doing so leads you to be less 'objective' about what you buy, and tends to lead you to make bad or unhealthy purchasing decisions. A great habit to get into is to write lists before you shop - and stick to them when in the supermarket, as well as shopping on a full stomach!

The largest organ in the body is not acutally the skin. The layer of cells that line blood vessels takes the prize - the endothelium.