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  1. I came across this gem - a cross sectional/correlational study on being a father and T levels. The reason I think it's important is that Tanzanian hunter gatherers are known to eat 100-150g of fibre daily, something many of us here do. In addition they have a low BMI and low energy intake. http://rspb.royalsocietypublishing.org/content/276/1655/347 I'm typing this from my phone so my response has to be limited, but here were some points I picked up on: -their T in general is far lower than Americans - 150 pmol vs Americans being 250-400pmol (I'm not familiar with this unit and google didn't help) -caring for offspring closely lowered AM T by 30% and PM T by 50% (same trend not seen in America) -more closely caring for children lowered T more, while distance parenting didn't -fidelity lowered T -T didn't vary by age in these groups, suggesting you can maintain some T as you age Maybe this is why some CR practitioners like Paul McGlothin are able to maintain youthful T levels. Thoughts?