Study at UBC a few years ago showed that more ritalin was prescribed to those in the lowest socio-economic levels.
between 1990 and 1996 it was just over a 10fold increase in prescriptions.
Sadly most were not properly evaluated, and many still are prescribed ritalin when many other factors are likely sources, including poor nutrition, reaction to dyes or chemicals in foods, relative age compared to group etc.
Like any prescription (take statins for example) the process is prescribe then figure the end game later.
Rather than trying the more exercise, remove sugar / coke / fruit loops / nitrates from the diet and evaluating the true cases, our stressed medical system goes for the prescription pad first.
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