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Caffeine increases mental alertness and concentration and can improve performance. However, too much caffeine (and this will be a different amount for each person) has been found associated with: anxiety, cravings, depression, emotional instability, insomnia, mood swings, nervousness and premenstrual syndrome (PMS).

You can avoid the highs and lows of mood and energy associated with fluctuating blood sugar levels by choosing foods that are digested slowly. These foods have a low Glycaemic Index and include wholegrain rye bread, oats and basmati rice. High GI foods, which are best avoided, include french baguettes and instant white rice.

The romantic associations we have with chocolate may be due to the effects on the brain of a naturally occurring substance called phenylethylamine PEA. PEA can enhance endorphin levels, increase libido and act a natural antidepressant. Sugar can also increase levels of the body's natural endorphins and chocolate bars often contains appreciable amounts of sugar. These mood-altering effects of chocolate may be why it is easy to become 'hooked on' chocolate.