Chapter 1: Bridges to Life by Ray Kurzweil & Terry Grossman argues that we should adopt a bridge strategy to keeping healthy and extending healthy lifespan. Bridge 1 is things we can do right now including exercise, nutritional supplementation and caloric restriction CR ('...in rats optimal level of caloric restriction... is 2/3 of ad libitum feeding' & 'for humans eat 20% less calories than ad libetum' eg 180 pound moderately active man uses 2700 calories ad libetum, a 20% CR diet is 2160 calories per day.)
Bridges 2 biotechnology and 3 Nanoscience will come later so we must use Bridge 1 strategies to have a chance of living long enough to benefit from later Bridges ('we are only 15 years from maturation of the second bridge'). This chapter reviews their 2009 book 'Transcend: 9 Steps to Living Well Forever'.
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