Se tomarmos como exemplo paises Europeus cuja população é notoriamente alta veremos que a expectativa de vida neles se encontra entre as maiores do mundo.
Por exemplo a Noruega temos uma expectativa de vida de 82 anos para mulheres 77 para homens, na Filândia temos 82 anos para mulheres e 75 para homens.
E
dentre eles?
Uma coisa é ver, baixinhos do Brasil em algum lugar miserável e com muita desnutrição versus noruegueses, e noruegueses altos versus baixos e brasileiros altos versus baixos.
E os pesquisadores detectaram o mesmo padrão em outras espécies também.
Mesmo no Brasil levantamentos indicam que a estatura média cresceu (, e que esta é uma tendência mundial entre populações que aumentam seu índice de qualidade de vida )...:
...entretanto a expectativa de vida do Brasileiro subiu para 73 anos depois de 2003
Como outros colegas neste debate levantaram acredito que mais fatores estão envolvidos na mortalidade do que a estatura do índividuo.
Obviamente que devem ter
Duvido que a mortalidade seja meio que determinada somente pela estatura, mais do que qualquer outro fator, seria algo um tanto estranho... para não dizer absurdo...
Seria ainda interessante conseguir o artigo original para avaliar a metodologia utilizada.
[ ]´s
Seria mesmo.
Vi agora que nos artigos relacionados do link que passei tem um outro artigo que já propõe que o mecanismo seja mesmo o encurtamento dos telômeros, e se foca mais na diferença de longevidade entre sexos, do que alturas de modo geral.
Tying it all together: telomeres, sexual size dimorphism and the gender gap in life expectancy.Stindl R.
Institut fur Medizinische Biologie, Medizinische Universitat Wien, Wahringerstrasse 10, 1090 Vienna, Austria. reinhard_stindl@yahoo.de
The classic explanation that women outlive men solely due to hormonal and lifestyle differences, does not withstand a critical analysis. In developed countries, the average gap in life expectancy between the sexes is 7 years. It has widened over the last decades, despite the trend of women copying the 'unhealthy' lifestyle of men. Estrogen levels in postmenopausal women are virtually identical to estrogen levels in males and can hardly explain the discrepancy. Furthermore, testosterone got its bad reputation from one study on mentally retarded men, which has to be interpreted with caution. However, sexual size dimorphism with men being the larger sex in conjunction with the limited replication potential of human somatic cells might account for higher mortality rates in males, especially at old age. The hypothesis, as presented here, is based on the well-known concept of a cellular mitotic clock, which was discovered by Leonard Hayflick almost half a century ago. The underlying counting mechanism, namely the gradual erosion of chromosome ends (telomeres) due to the end replication problem of linear DNA molecules, was first described by Alexey Olovnikov in 1971 and with minor modifications has become a widely accepted paradigm. In a recent Lancet study, an inverse correlation between mean telomere length and mortality in people has been found. In this and two other studies, it was confirmed that males do have shorter telomeres than females at the same age. This is almost certainly a consequence of men being usually taller than women, although nobody has done an investigation yet. Clearly, a larger body requires more cell doublings, especially due to the ongoing regeneration of tissues over a lifetime. Accordingly, the replicative history of male cells might be longer than that of female cells, resulting in the exhaustion of the regeneration potential and the early onset of age-associated diseases predominantly in large-bodied males. Inherited telomere length variation between unrelated individuals might have obscured a clear correlation between body height and mortality, leading to conflicting results in some studies. Finally, I propose that the secular height increase over the last decades, of about 2.5 cm per generation in the western world, has to be blamed for the widening of the gender gap in life expectancy.
link(o texto completo também não é grátis
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