Catch EATEN ALIVE Sun Dec 7 9/8c on Discovery. | http://www.discovery.com/tv-shows/eaten-alive "I'm about to be the first person to be eaten alive by an anaconda," the nature lover does in fact say in the trailer, and presumably the next bit - about how wild anacondas rarely attack humans, and in recorded history have never eaten anyone - was cut.
In the second trailer (which I haven't seen but a hapless Discovery intern probably misplaced somewhere) Rosolie, to avoid fear-mongering, likely chats with a biologist, anyone really, but I imagine it's some sort of anaconda expert and together they both reflect on how few-and-far-between anaconda attacks are and that there are no recorded fatalities.
Likewise, Rosolie quotes (I'd guess) at length from a scientific report, like this one: "Large constrictors snakes are potentially dangerous to people due to their size and strength (Branch and Haacke 1980). However, there are no documented attacks by green anacondas (Eunectes murinus) on humans."