Cat people are also overrepresented cohorts of wealthy people and women, two cohorts who have a much lower risk of heart attack than the most at risk cohort of poor men.
Possibly. It would make sense, people with poor health who tend to also be poorer financially are less likely to have the ability to take care of a pet.
I have 2 cats.
One of them seems to sense when I'm upset or unwell, and will come to hug me, wrap herself around my neck and purr in my ear.
Then the other one will sneak up on us from behind, jump on her back, and start a cat fight on top of my head.
I love them both, but sometimes I wonder whether getting a second cat was the right decision.
Depends on the cat. There's some that will let you do just about anything and at most bat you with a paw, claws retracted. Then there's others that if you don't pay attention and pet them just a fraction wrong will take your arm off. Know your cat.
So someone better than me at maths could probably figure out how many cats I'd need to heat my with them room (and if the catfood etc needed would be cheaper than heating) ...
I can answer the second question:
Generally, hot-blooded mammals transform 90% of the energy they get from food into heat.
So using a cat for heating your room is about 90% as effective as burning cat food in an oven.
Here's some napkin math for where I live:
1kg of firewood has 4kWh = 4000 kcal
which is about equivalent to 1kg of really cheap dry cat food (mostly carbohydrates)
1kg of firewood costs about 40 cents
1kg of cheap dry cat food costs about 1,20€
So, cat-based heating is about 3.3x more expensive than burning pre-dried, commercially purchased firewood.
(all of these prices heavily depend on how much you buy in bulk, though. And if you care about your cat's well-being, you're gonna spend 2x more on its food)
One of it's purrrposes is to shake wounds and increase bloodflow. This is why cats sometimes pur after conflict; they're licking their wounds in multiple ways.