New Delhi: Males who experience rapid growth as babies are taller, have more muscle and also higher testosterone levels as young adults. The researchers believe that testosterone may hold the key to understanding these long-term effects and that genes alone do not shape our fate.
"There is a lot of evidence that this can influence risk of diseases like heart attack, diabetes and hypertension," Kuzawa said. Kuzawa and his collaborators applied the same framework in this study and found evidence that male characteristics -- such as height, muscle mass and testosterone levels as opposed to disease characteristics are linked to body`s response to nutrition and stress. "Another way to look at it is that the differences between the sexes are not hard wired but are responsive to the environment and in particular to nutrition," Kuzawa said. Testosterone has long been known to increase muscle mass and puts a person on a higher growth trajectory to be taller. The Northwestern study suggests that the age of puberty is also influenced by events in the first six months of life. The study is based on a group of 770 Filipino males aged 20-22 who have been followed their entire lives. IANS
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