While the MEND protocol is interesting and may be useful, it is a product [0] being sold with very little scientific evidence to support its use. Furthermore, Aging, the journal in which the sole study supporting MEND was published in, is not always considered a high quality source.
Regarding "get outside": take a look at the abstract for the study "Beneficial effects of sun exposure on cancer mortality". It starts with "For more than 50 years, there has been documentation in the medical literature suggesting that regular sun exposure is associated with substantial decreases in death rates from certain cancers and a decrease in overall cancer death rates". http://www.ncbi.nlm.nih.gov/pubmed/8475009
I have a friend doing research on this. I should caution that you should in no way take this as medical advice, as there are not yet any results, but the current hypothesis is that one's risk of getting melanoma (the main skin cancer that is truly dangerous) is actually less related to how long you stay in the sun and instead more related to whether your sun exposure is consistent (each day) or intermittent (you only go out in the sun a couple of non-consecutive days a week). If this hypothesis is correct, consistent sun exposure is significantly safer than intermittent sun exposure.
If you would like, I can provide links to papers that support this hypothesis.
I asked because I just started supplementing with vitamin D and forcing myself to get 15 minutes of direct sun exposure every morning since I started working/exercising indoors at home and rarely venturing outside during the work week.
That is something I would like to look into and appreciate a link if not a hassle. That hypothesis could change how I go about my daily exposure. How much exposure do you get if you don't mind me asking?
I've got several colleagues considering this. As their children move out of the house and the mortgages get paid off. They've qualified for the pension (collected at 60? 55? I can't remember, it's far enough off that it doesn't affect my planning much here). They're only in their late 40s or early 50s, so if they switch to 60/80% time they'll take a pay cut, we'll have money left to hire more people. We'll retain their knowledge base. They can ride to retirement comfortably with long weekends every week.
Related: here's an interview with the owner of an ISP who went through something similar. He was under a gag order for 6 years. The interview also has comments from the Lavabit owner and his lawyer.
Short overview:
http://www.today.com/health/new-brain-program-may-fight-alzh...
Article/Study:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4221920
The interventions (from the article/study):
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4221920/table/T1...
Video presentation by the doctor:
https://www.youtube.com/watch?v=QqQ_X3mD16U