I am usually a bit skeptical of foods and drinks that claim medicinal powers. In large part, this is because most claims don't come with supporting scientific data. I'm also aware that there are many myths about what does or doesn't help with various illnesses and ailments. I think we all have our personal "I think this works" approach! I'm not denying that there will be beneficial products or foods that aren't yet well studied - I am sure there are. However, I don't think firm claims should be made unless the data are already in.
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Immunity smoothie - murky, but tasty |
To give you an example, Vitamin C was lauded as a cure for the common cold for years. Many of us still think it helps to prevent illness, and vitamin companies trade off that belief to promote their products.
However, there is no evidence to suggest that Vitamin C can prevent colds in the general population, and plenty to suggest that it only slightly reduces illness severity. Last year, a large Cochrane review (you can read it in full
here) concluded that supplementation of Vitamin C (i.e., taking more than a regular dietary amount) may reduce the duration of a cold by 8% in adults or 14% in children. If you have a standard 5 day cold, this means that an adult taking extra Vitamin C from day 1 could feel better after 4.6 days instead of 5. I'd be happy with that, but it's not exactly a magic fix!
In contrast, zinc supplementation is associated with up to a 50% reduction in the likelihood of developing a cold, and the duration of a cold once developed (the Cochrane review on zinc is available
here).
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Zinc and Vitamin C |