Hey Justin. First of all - kudos to you! Down 115 is inspiring!
That’s a good question - how to talk to people. I don’t think there is a “one size fits all” explanation, especially not a simple, short one that’s easy to grasp, and that will be necessarily applicable to the person at hand. It’s such an individual thing. If somebody is at a very good weight, has no health problems related to diet, then a general “what ketogenic eating is” would likely suffice; it’s not like they need to change what they’re doing.
Much different for somebody who is overweight and insulin resistant. It’s been a huge eye-opener for me, and surely the number of people who really needed a keto diet, and who have benefitted massively and impressively, is growing by geometric leaps and bounds. The message that “this is what is wrong, and here is how keto can fix it,” is powerful.