1.  Dehydration

Surprisingly even the slightest slump in hydration of just 3% in bodyweight can cause mental fatigue and loss of concentration. The next time you’re light headed don’t assume you need food, try drinking water and if possible an electrolyte drink.

2. Intensive work outs

Working out can lower the stress hormone cortisol but prolonged exercise can have the reverse effect.  Interval training combining free weights and aerobic exercise can help to counteract this.

3. Medication

Medication can sap energy levels, beta-blockers, and antidepressants can be the main culprites. If you feel this is the case check with your doctor to see if there is an alternative.

4. Low iron

Iron transports oxygen around the body and removes toxins from the cells.  If you don’t get around 18 milligrams per day the body struggles to function correctly  and can lead to anemia.  If you feel constantly tired, check with your doctor to see if you should be taking additional iron in the form of tablets.

5. Alcohol

Alcohol has an effect on blood sugar levels giving an inital high then slump in energy levels, avoid having at lunch time.

6. Carb rich lunches

High carb lunches can create a mid afternoon slump, simple carbs give a rush of energy. Although this rapid absorption can be beneficial because it provides quick energy, it also results in dramatic increases in blood sugar levels. When your blood sugar level inevitably drops, you will feel fatigued and lethargic due to the rapid fluctuation.

7. Mobile phones

Checking your mobile phone before bed stimulates brain activity making it harder to get to sleep – also make sure you turn down the volume at night so you’re not woken by text or e mail messages.