Caffeine is found in many foods that are commonly eaten or drunk over a day. These include coffee, chocolate, black tea, soft drinks which account for 98% of the average persons daily intake. But caffeine can also be found in other foods and medicines.

  • 1 mug of instant coffee: 100mg
  • 1 mug of filter coffee: 140mg
  • 1 mug of black tea: 75mg
  • 1 can of “energy” drink: up to 80mg
  • 50g of plain chocolate: up to 50mg
  • 50g of milk chocolate: up to 25mg

Recommended daily caffeine limits:

  1. Pregnant women – 200mg
  2. Everyone else – 400mg

Cons: Generally only occur with excessive consumption

  • Pregnancy: Effects of caffeine on pregnant women has been shown to be associated with babies born with lower than average birthweight and have increased chances of being smaller for their gestational age (SGA). This was due to rapid absorption across the placenta and thus affect blood flow in the placenta and affected foetal growth.
  • Heart conditions: Over consumption has shown links with increased heart rate, increased blood pressure and possible irregular heart beat.
  • Insomnia
  • Increased risk of anxiety and panic attacks

 

Pros: Generally only occur with recommended consumption

  • Increased basal metabolic rate
  • Increased short term memory
  • Possible reduced risk of prostate cancer and breast cancer
  • Possible protection against onset of Alzheimers
  • People who drink 2 – 4 cups of coffee per day are less likely to become depressed

 

Sources:

  1. https://www.mja.com.au/insight/2013/6/news-brief
  2. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3198027/
  3. http://www.health.harvard.edu/press_releases/coffee_health_risk
  4. http://www.bbc.co.uk/news/health-15982904