Caffeine and Sleep

How much caffeine do you drink?

What are the health benefits of caffeine?

The good news first. Beyond the obvious benefits that caffeine can have in terms of pleasure (there is often an enjoyable ritual in making and drinking a cup of tea or coffee), helping us to get going in the morning, maintaining focus and concentration at work, or keeping us awake on late-night drives, caffeine may also come with some other health benefits.

Caffeine-containing drinks, including coffee, black tea, green tea and even cocoa, for example, also may contain relatively high amounts of health-boosting polyphenols.

Polyphenols are a group of beneficial dietary antioxidants and are found in particularly high concentrations in brightly coloured fruits and vegetables, tea, coffee, spices, dark chocolate and red wine. Take a look at this article on why eating the rainbow is not a cliched phrase for more background on this topic.

Polyphenols have been reported to play a possible role in the prevention of some cardiovascular disease, neurological diseases and perhaps even diabetes (Scalbert et al., 2005). More specifically, caffeine consumption has been linked to a possible decreased risk of Parkinson’s disease in some people (Costa et al., 2010), while green tea may potentially be beneficial for reducing heart disease and stroke risk (Pang et al., 2016). More research is required to confirm such associations, but they do offer some hopeful possibilities for future studies to build upon.

A review published in the British Medical Journal examining lots of different studies into coffee and various health outcomes found that the greatest benefit of coffee consumption for all-cause mortality and cardiovascular disease was seen at around 3 cups a day (although this is a population level study, so this intake might not apply to you as an individual). Interestingly, decaffeinated coffee was also found to have beneficial effects on the same outcomes, with estimates suggesting 2-4 cups a day having the largest effects (Poole et al., 2017). However, more rigorously designed studies are again needed to confirm these findings.

Caffeine may also be beneficial to support sports performance, by reducing perceived fatigue (Doherty and Smith, 2005) and potentially increasing muscle power output. This is often used to athletic advantage, as fortified sports gels frequently contain the same amount of caffeine as a large mug of coffee.

Are there any downsides of caffeine?

Alongside the potential benefits mentioned above, there are also a few circumstances where excessive caffeine may be detrimental to our health.

Although this is not a completely comprehensive list, below are a few examples of times when being conscious of your caffeine consumption may be beneficial:

• If you are planning pregnancy or are currently pregnant, national guidelines recommend that you avoid consuming more than 200mg caffeine per day, as high caffeine consumption has been potentially linked to an increased risk of miscarriage, having a baby with a low birth weight and preterm birth (Poole et al., 2017).For more information on this; https://www.nhs.uk/chq/Pages/limit-caffeine-during-pregnancy.aspx

• If you suffer from anxiety or panic, the physical symptoms of caffeine consumption (such as nervousness, palpitations, irritability or stomach upsets) can sometimes make your worry feelworse. It may be better to cut right down on caffeine in these instances. It’s one of the first things that may be recommended to clients who are particularly struggling with worry and poor sleep.

• Excessive caffeine consumption can, in some cases, lead to palpitations and ‘ectopic’ heartbeats (the feeling of your heart beating in your chest). Of course, it is absolutely essential to discuss any symptoms like these promptly with a doctor, but you may find that you are encouraged to moderate your caffeine as part of your management plan.For more information on this; https://www.nhs.uk/conditions/heart-palpitations/

• If you suffer from insomnia or sleeping difficulties, you are probably already being mindful of minimising your evening caffeine intake. But any caffeine consumption, even first thing in the morning, could still be having an impact. It will somewhat depend on your genetics, however – that’s why some lucky people can neck a couple of espressos before bed and still sleep like a baby.If, however, you are struggling with your sleep, you may like to try cutting down (or even cutting out) caffeine completely for a couple of weeks to see if this makes a difference. Start by reducing caffeine consumed after 3pm. Some people find that they need to stop caffeine as early as 10am to positively impact their sleep. It is a case of individual trial-and-error to see what works best for you, understanding that this may well change over time.

• Habitual caffeine consumption may lead to a certain amount of tolerance; you may end up needing a bigger ‘hit’ to get the same energising effects. This can be a particularly vicious circle for those suffering from fatigue; the more tired you feel, the more you reach for a caffeine boost – which eventually increases your tolerance and means you need even more caffeine to feel ‘normal’.If you suffer from fatigue that is impacting your daily life, it is always worth discussing this with a qualified healthcare professional to see if there is any underlying cause that needs addressing in the first instance.

• Caffeine intake may also increase blood pressure slightly (although potentially less so when consumed as coffee than from other sources) (Noordzji et al., 2005). If you suffer from high blood pressure, it may therefore be worthwhile sticking to moderate amounts of caffeine (approximately 200-300mg/day). More research is required to give definitive answers on this topic.

• If you suffer from osteoporosis, or are considered to be at risk of developing weak bones, it may be sensible to limit the amount of caffeine you consume, as it can potentially interfere with calcium absorption and excretion, particularly with higher intakes (Wikoff et al., 2017). This effect may be more significant in women (Poole et al., 2017). Again, the pragmatic solution might be to just stick to a sensible and moderate amount (no more than 400mg/day) and to make sure you are consuming plentiful of sources of calcium in your diet too.