Confessions of a GP - Benjamin Daniels [34]
Evidence
I was being dragged round town on a Sunday morning and, despite the fact that I really fancied a coffee and some cake, my wife wanted us to try out one of the new trendy juice bars that had sprung up. The man behind the counter had a silly pointy goatee and a ponytail. I asked him what a acai berry was given that it was going to make up one-fifth of my five berry smoothie. ‘It’s hand picked from the shores of the Amazon, man.’ (I doubted this.) ‘It’s got 100 times the vitamin C of an orange so a real natural high. You’ll be feeling great all morning and it’ll keep those colds at bay.’ He looked really pleased with himself as he handed me my smoothie and I wondered what other nonsensical medical advice he gave out to his customers. ‘Eat a papaya and cure your verruca.’ ‘Eat some raspberries and your friends will like you more.’ I was desperate to tell Mr Goatee Man that there was no evidence to suggest that eating excess vitamin C was of any benefit in keeping colds away and that it wouldn’t give me a ‘boost’, why would it? Added to this was the fact that if I received any more than 200mg of vitamin C, I’d simply shit and piss out the excess so might as well stick to an orange, which was much tastier and cheaper. My wife knows me too well and gave me a look that meant stay quiet and don’t embarrass her in public. I took my smoothie and sat down. Irritatingly, it was really nice and made me feel quite revitalised.
Mr Goatee Man and his smoothie are part of a growing trend of advertising and marketing of ‘healthy products’ with huge claims about medical benefits without any evidence to back them up. This might seem like a typical rant from a closed-minded doctor, but I genuinely have nothing against my patients taking many herbal remedies and dietary supplements. Many of our medicines originate from plants so perhaps some of them may have genuine medical properties. Saint John’s wort, for example, is shown in clinical trials to be effective in the treatment of depression. What I object to is health food companies playing on people’s fears and anxieties with regard to their health by making unproven medical claims to sell their excessively expensive products.
Doctors work by the rules of something called ‘evidence-based medicine’. The principle of this is that if I want to prescribe you something, it should be of proven benefit. In the past doctors gave out all sorts of tonics and pills based on guesswork and trial and error. I’m sure some of these medications were effective and helpful, but many would have been no better than a placebo. Nowadays we are supposed to apply some evidence to everything we prescribe. If you come to see me with high blood pressure, I can think of 10–20 different pills I can start you on. As the patient you need to put your faith in me giving you the most effective pill for your condition. I can make a decision based on my own experiences over the years after having tried a few different pills on a few different patients. Or I can make my decision founded on a trial of over 10,000 people with high blood pressure that looked with minimal bias at which drug or combination of drugs seemed to reduce blood pressure most effectively and with the fewest side effects. These studies are by no means perfect and as an individual you may not respond in the same way that the majority of people did in the study. However, isn’t that a more accurate way of deciding your medication than by me choosing which tablet I most like the name of, or which medicine has the prettiest drug rep who takes me out for lunch most often?
Soon after my smoothie, I was stopped in a shopping mall by a guy selling eucalyptus cream for diabetics.
‘How does this