Click this link to read more on the Huffington Post: http://www.huffingtonpost.com/2013/09/16/healthy-lifestyle-telomeres-lengthen_n_3916235.html
It appears that healthy choices make your telomeres longer. How is this happening? Increased telomerase activity.
How is that happening? Probably better quality sleep and decreased cortisol levels, inflammation, and damage to stem cells.
To learn a grand unified theory of aging and disease that dovetails with this clinical research, read “Telomere Timebombs: Defusing the terror of aging”
Here is a link to the Ornish article (coauthored with Nobel Prize winner for the discovery of telomerase, Elizabeth, Blackburn): http://www.ncbi.nlm.nih.gov/pubmed/18799354