See Micheal Mosley's Eat, Fast and Live Longer
Also see Mosley's The Truth About Exercise:http://www.kpbs.org/news/2013/apr/08/truth-about-exercise-mi...
True. I'll try to get a blood test next time. What are you guys recommendation on what to check?
I am not a doctor. You should definitely talk with a doctor. But, you can google for "health blood markers" which typically includes measuring cholesterol and glucose to start with. For example:
http://www.marksdailyapple.com/blood-test-markers/
http://circ.ahajournals.org/content/107/3/499.full
https://labtestsonline.org/understanding/analytes/cardiac-ri...
Also, it's probably not a bad idea to measure your blood pressure regularly which you can easily do at home.
https://vimeo.com/103656060
Personally, I'm following a 5:2 intermittent fast this year while also maintaining 63 mi/week running, including 9 mi on the days I fast.