It won't be necessary to leave the secured area to change terminals at DFW. The Skylink tram system connects them all and it is inside the so-called 'sterile area'.

Besides the previously mentioned lack of amenities outside security at DFW I would not recommend leaving the secured area because, with a one hour connection, once you subtract the time needed to get off your original flight and get to your new gate in time for boarding you'd only have a few minutes landside, not time for much beyond "Howdy, Tex" and "Goodbye, Tex". There are ways a non-passenger can get a pass to come inside security; frequently mentioned here are scheduling a meeting at an airline club like American Airlines' Admirals Club (You didn't say but if you're transiting from "A" to "B" you're almost certainly on AA) or having the person you're meeting purchase a fully refundable ticket for the day of your flight, then request a refund for it after getting through security.