I have been on Atkins/Keto most of my adult life. I started out in college on my broiled wiener diet, having no idea it was Keto, but I lost weight.
I am now 79, in great health and get 3 pages of blood work every 90 days to make sure all is well. I should exercise more, but I am a couch potato or working long hours at my home office desk.
I do not prepare anything. I microwave most everything, and used to thrive on Atkins prepared frozen food.to microwave.. Now replaced, to some extent, by Jimmy Dean's since Atkins no longer offers its great prepared meals. I have never used an oven!
I was on and off it for many years, but pretty much on for the last 20 years, other than when I travel, like my trips of about a week at a time to Toronto. Then I fine dine at Denny's, etc. I gain a few pounds, but go back to Keto and lose them after a few days. I have a good setpoint, and for many years, Keostrips showed moderate ketones.
I am 6-1 (shank a bit with age as we all do). In youth, I just barely missed tiptoppers that require 6-2. I once weighed 250 lbs., but for years now I have maintained in the mid- to upper 190s.
I have learned to ignore calories, just keep carbs relatively low (maybe 20/day) and also monitor sugar. Atkins still has some snack stuff I use, but you have to avoid too many artificial sugars, or you will need the toilet.
Yes, about once every few weeks will have a Mint Oreo Blizzard at DQ or enjoy a choc shake at Denny's (with the tin). Or even McDonald's ice cream sundaes, etc.
It is probably easy for me since I have been on and enjoy the diet, and my body has adjusted. I also take various vitamin supplements since, other than apples, I don't have much fruit or veggies.
I have a list of foods I choose from, mostly get them from Amazon since same-day delivery, and even in Phoenix, they keep their bags cool with frozen water bottles, etc., which keeps them cool till I get them into my freezer after delivery is left outside. We have a huge Amazon distribution center in Phoenix, and I can order at 3 AM and get delivery by the time I am up (night owl go to bed usually around 5 AM)
Breakfast is Jimmy Dean Breakfast bowls microwaved for 3 minutes.
Since ignoring fat content, one is never very hungry since dietary fat doesn't go to body fat unless there is an insulin reaction, which is a complex interaction with carbs.
I eat when I'm hungry, not based on the time. Recently found great HMR means (Veg stew, Turkey Chili, like the best.) No refrigerator needed, just microwave for 1 minute after lifting the corner to vent.
Keto bread, with keto strawberry fruit spread, or Keto honey.
Lots of other stuff delivered by Amazon. I have a busy life and have no time to go shopping at stores.
When traveling, I often use Marriott Residence Inns so I can get prepared foods with larger refrigerators and microwaves than just regular hotel fridges. Don't have to eat out all the time, and when I do, I avoid the normal hours, so it's not as busy. I always look up the nearest Denny's or Perkins, depending on the city.
That is my story. Not for everyone, but it works for me.