Q: I've heard that cardiovascular exercise can prolong life; is this true?

A: Your heart is only good for so many beats, and that's it... don't waste them on exercise.  Everything wears out eventually. Speeding up your heart will not make you live longer; that's like saying you can extend the life of  your car by driving it faster. Want to live longer?  Take a nap.

Q: Should I cut down on meat and eat more fruits and vegetables?

A: You must grasp logistical efficiencies. What does a cow eat?  Hay and corn.  And what are these?  Vegetables.  So a steak is nothing more than an efficient mechanism of delivering vegetables to your system.  Need grain?  Eat chicken.  Beef is also a good source of field grass (green leafy  vegetable). And a pork chop can give you 100% of your recommended daily allowance of vegetable products.