Me: “I really like being in ketosis and doing intermittens fasting.”
Friend: “Sigh… I can see you lost weight, but keto is SO bad for your health, I don’t understand that you would sacrifice your health for losing weight.”
Trying to make him accept that I don’t believe it is bad for my health, was just me living in denial on some crazy cult diet.
So I gave up 
How good a friend?.. not very supportive so maybe time to let go?
Edit to add… otherwise bombard with science from Virta health?
Yeah, I’m to the point where I just say I’m on a “low carb diet”, which is miraculously a normal/ healthy diet…
I also wait until people say “Wtf?! How much weight have you lost and how do I buy the fat burners you take?!” Haha No pill, just discipline.
If people think It’s unhealthy or have concerns, I always say “Just like everything else on the planet, keto is not for everyone. It affects everyone differently.” They will all come around as the science becomes more mainstream.
I don’t discuss much, if I do then only with carefully selected people and even then it’s easier to just say I don’t eat starches or sugars as this seems acceptable whereas high fat is somehow scary 
Just tell them you’ve cut back on carbs and sugar, they’ll give the nod of approval usually. Most people don’t equate carbs with sugar so if they want to know why the carbs, you tell them that is converted into sugar by the body. Again you’ll get the nod of approval. DO NOT mention fat!! 
Yeah, most people seem cool with cutting down on carbs, but not cool with keto. I think they don’t realize that if fewer carbs is good, then even less would be better. It’s that fat, though; it’s gonna take decades before people don’t immediately and staunchly and automatically associate dietary fat with being fat heart disease.
Just remember the first rule of Keto Club . . . ! 
I was in a coffee shop today getting my heavy cream latte and the customer in front of me was talking to the barista. “Heavy cream, that’s almost as bad as eggnog,” he said. I had to bite my tongue and not explain that the problem with eggnog is the sugar, not the cream, but people are so indoctrinated that they just can’t hear a differing viewpoint.
As they sit there and eat McDonald’s “your diet is so bad for you” I hear it all the time.
So the way I understand people:
All new science that says something different is wrong, and all the old science is correct, and all new science that says that fat and meat is dangeroures is 100% correct. And these facts can never be changed.
I tried this and even though I feel I come with good arguments, it takes 2 seconds to google some article that test on mice with some strange kind of vegetable oil and make their heart pop.
Except, of course, keto is unsustainable, because the food is so restrictive and boring, so we won’t be able to keep it up. But it will still kill us, of course!
Ha! I just say “keto” and DGAF. But I do that with a lot in my life. Life is too short to listen to people who put you down rather than lift you up. 
It’s also too short to waste time trying to explain to people who aren’t really interested in listening which is why it’s easier for me just to not discuss it
I have started saying that I have an allergy to sugar.
This helps at restaurants too.
I have used celiac as an excuse sometimes.
But at Denny’s - 
they don’t have real butter anywhere in the store…
I don’t talk about it much anymore unless people ask, which is getting less and less as they’ve gotten used to the new me. While I was in the process of losing weight, I had a couple of people ask me to be their support. I was more than happy to do that, but after meeting with one just once and the other a couple of times, they stopped meeting with me. They appreciated the encouragement, I know, but I don’t think they were ready to commit, despite knowing the science. When people are really ready, they’ll get on board and do it. I won’t consult like that again, though. It takes a lot out of me to do it and I can’t overcome their addictions for them.