ALL healthy diets are based on eating real foods, prepared from real, non-processed, non-manufactured ingredients.
Unfortunately, that can require developing new habits - like learning how to shop for all of that healthy real food you haven’t been eating, learning how to prepare it, and in some cases learning how to cook and learn new recipes.
This is both a big challenge for me (fitting in the time) and also a source of some enjoyment - it turns out I am a pretty good cook when I have the time for it and have all of the ingredients I need. I make some wonderful meals.
But some days, when I am getting off late from work, the thought of having to shop for groceries on the way home, then cook, so I can eat, and then spend another 30 minutes cleaning the kitchen and running the dishwasher, is not always appealing.
However, I am making myself do that because if I am going to succeed over the longer term, I MUST change my habits and the way I think about food. Yesterday I stopped at the grocery on the way home (late - about 7:30pm) and was just there to pick up some almond milk. However, they had a good deal on steak (good sized NY strip for $4.18) and I grabbed a broccoli crown from the produce section. Got home and had pan-seared steak and steamed broccoli with butter.
The more I do it, the more it’s like tearing off the top of a bag of chips or making a ham and cheese sandwich - it’s just something you do when you want to eat. Heat the skillet, chop the veggies, salad greens in the bowl, grate some cheese, drop in that steak / salmon / chicken / scallops and cook it up. Veggies in the steamer or saute in another pan in a tasty fat with some spices and seasonings. Boom - hot, fresh, healthy meal that tastes awesome.
As far as restrictive - I eat a wider and healthier variety of foods now than I have in a long time. A wide variety of meats, fish, vegetables, greens, dairy, nuts, healthy fats.
That’s the issue behind why the modern way of eating results in bad health outcomes. It is convenient and doesn’t take a lot of time to eat manufactured edible food-like products. Eating healthy takes a commitment of time and learning.
There are ways to do low-prep and limited-cooking eating that is still keto. That’s what I would would consider hard to follow long term myself.