Their lifestyle is conducive to sickness. Their sleep is disrupted--anyone that works anything other than the standard shift is going to have boasting sessions and/or field circus in the way of sleep. Plus, they keep heaping work on you. They don't know when enough is enough. You are doing 10 hours a month, do more. You auxiliary pious-sneer one month, "Good. Now that we (and joke-hova) know you can do it, you are required to do it all the time". "It's only 2 hours a day."--that is, not including dressing up, going to the place where they meet, arranging the groups, and getting to the territory. Can anyone work full time, pious-sneer, and still get enough sleep?
Most of them have wretched diets. True, a few are health nuts--living on soy protein (itself as bad as the worst junk food) and taking supplements that are about as good as drug store specials. But, too many of them eat fast, good-tasting poison every day for lunch. I have seen more of them stopping for a quick sandwich at Seven-11, usually something thrown in the microwave (food poisoner). More frequently, people stop for Big Macs every day. This cannot possibly be healthy? And the sodas? More than once I have seen witlesses stop for a Coke--I would splurge and get orange juice, but that was in the minority. Along with a bag of potato chips, usually flavored with monosodium glutamate. Besides the poison, I wonder how many of them get the basic vitamins. And even among those taking all those drug-store quality vitamins and soy protein, I wonder if any of them get enough magnesium.
Combine this with more poisons. You go into people's houses. There is a wide assortment of germs (including tuberculosis). All too often, I have gone on calls where the householder and/or other members of the household were smoking cancer sticks non-stop during the call. People are exposed to every kind of air "freshener" imaginable, gas fumes, suit dry cleaning fumes (which are particularly toxic and rank right up there with second-hand tobacco smoke as cancer-causing), and cheap perfume (much of which is toxic, especially when you blend 100 kinds and mix it together) imaginable. For a religion that bashes smoking as causing lung cancer, they expose people to enough chemicals from the territory or dry cleaners to cause an even worse lung cancer problem.
And what about fumes at the Kingdumb Hell? Most of them are new or refurbished less than 10 years ago, because of the debt they wish to project on the congregation. It also means formaldehyde from carpets and particle board never gets a chance to dissipate. Without windows that actually open, ventilation is atrocious. Besides whatever perfumes and book fumes were in the building the last year that have had the chance to mix and react with each other (sometimes producing even worse fumes), these buildings trap noxious fumes. And the electronic pollution isn't much better. Alarm systems, squiggly "light(??)" bulbs, and close proximity to everyone's cell phone also take their toll on everyone present.
Throw in the accidents and mishaps that people get hurt on, and you have a mess. How many have been in car accidents, hit by a car trying to start their time, bitten by dogs, threatened or hurt by householders (usually after multiple warnings not to return), and so on do witlesses get exposed to just doing their "duty". Not to mention lousy construction. You live there, you are used to railings in bad condition and unsafe stairs. You are there going door to door, you are not--hence, more likely to fall. And there is always one apartment building where they depend on a single light bulb to light a stairwell with no daylight. What if the lights go out while you are on the stairs or at the top? Or, what if the light bulb blows? People can and do fall down those stairs when plunged in pitch dark without warning, and they are bound to end up in the hospital to be exposed to more stress, more pills, and more pressure from Brother Hounder to keep up their time while in the hospital.
Beyond that, they are more spiritually sick than others--which could fill up yottabytes of space trying to detail this condition.