Journal of IiME
Volume 2 Issue 2
www.investinme.org
Family Illnesses Among People with ME/CFS: Blood Versus Non-Blood Relatives
(continued)
found 5 total cases of diabetes for all nonblood
relatives, whereas for the fathers of
people with ME/CFS, there were 20 cases.
These findings suggest that at least for
diabetes, the outcomes are not likely due to
there being more blood relatives than nonblood
relatives.
Furthermore, one could argue that a person
may have more non-blood relatives than
blood relatives. According to the United
States Census Bureau (2000), the average
family size in the United States is 3.14. Using this
statistic, after four generations of two parents
having one child, a fourth generation person
would have 14 blood relatives. These 14 blood
relatives are the person’s: 8 great
grandparents, 4 grandparents, mother and
father. However, when this individual marries
their spouse, assuming their spouse is also a
fourth generation person from one child
families, this individual will gain 15 non-blood
relatives. These 15 non-blood relatives include
their spouse, and their spouse’s 8 great
grandparents, 4 grandparents, and 2 parents.
Therefore, it is at least conceivable that there
might be as many non-blood relatives, if not
more, than blood relatives.
In general, the findings of this study found that
family members who are related by blood
have several medical illnesses at higher rates
than those who are non-blood related.
Certainly, the findings are strongest for
diabetes, and it is always possible that recall
bias influenced the results. However, the
robust nature of the outcomes indicates this is
an area worthy of future investigations, and
having medical work-ups of both blood and
non-blood relatives would strengthen
research. There are policy implications of this
work, for if individuals with ME/CFS do have
blood relatives with more medical illnesses, it is
possible that both genetic and environmental
factors need to be considered when
understanding the etiology of this illness and
when providing treatment for those with this
illness.
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