Salted grass fed butter, other dairy stuff and eggs keep you alive and induces/maintains ketosis.
There's just the little problem that muscle needs carbs to be build, and there you are challenged to find the most tolerable form of carbohydrates for yourself.
It hasn't to be much, but a few calories before you get to physical work - preferably in the form of green vegetables (including potatoes). Ditch fruits, they are almost poison for a perfectly working metabolism. You could mix in coffee, which acts as an insuline moderator. It does produce an initial blood sugar spike in healty people when consumed with carbs, however. If you didn't already do so, there's a bit to reseearch about coffee and its effects on insuline in various combinations, but it may be of some value for you.
I agree generally with what you say here, but the bolded part I'm going to have to vehemently disagree with.
That is a myth continually perpetuated by the media.
As long as you stick with fruits that are low on the glycemic index, and stay away from consuming both high glycemic fruits and dried fruits on a regular basis, you are good to go.
I get probably 80-85% of my daily carb intake from low glycemic fruits (in the form of protein shakes twice daily, berries mostly mix with full fat milk), and the other 15-20% from vegetables (broccoli, cauliflower, asparagus, carrots, peppers, etc). Some days it's more like 95% fruit as carbs. I'm probably right around 50-60 grams carbs on average daily. I don't eat any other forms of carbs during the year, except for maybe a once or twice a year slice of pizza or sushi as a special event/treat. I don't drink any alcohol, not any more, period.
At 55 years old, I'm shredded with extremely low body fat. In fact my metabolism has never been higher or better (well, since early college days anyway).
So fruits as poison? Kill metabolism? Complete media BS.
Thanks for pointing me at this. First, the bolded sentence is biased, because i'm fructose intolerant, second it was meant for the scope of diabetic individuals.
It's indeed the glycemic index that makes the difference.
What i was meaning: Mainly fruit you get at the supermarkets, high sugar, low tannines -type of variants. "Designer apples", if you want to call them this way...
Personally, i'd ditch the protein shake powder (if you're using these readymade ones) for shakes with dried egg white.
I used to use Soy isolate, but those need to be highly chemically processed to get rid of the fats contained in Soy (and other fatty protein sources).
I decided against posting a body pic of mine, because of tattoos (OpSec), but i'm slightly younger and similar shaped. So both of us are doing something right when it comes to fitness and aging

Gotcha, understood. We agree on the high glycemic fruits being not great. I never eat those throughout the year (i.e. things like melon, papaya, pineapple, grapes. Bananas only an occasional small piece in my protein shake, never a whole one).
I eat plenty of eggs, boiled mostly, but sometimes omelettes or scrambled. Plenty of dairy, organic whole milk, cheese, plain greek yogurt, and organic kefir.
I avoid any ready-made or off-the-shelf protein shakes, because they are all low quality protein with low bio-availability and loaded with high fructose corn syrup and other garbage.
Only use high-quality protein powder for my shakes, either 100% whey or a casein/whey blend with no crap added. My current favorite go-to for Whey protein powder is Pure Choice Farms. It's awesome. A bit expensive, but their powder only has literally like 3 ingredients and that's it.
Understood about the body pic. I really hate posting any selfies for OpSec reasons and because I think it can come off as egotistical, boasting or something. But when it comes to discussions about health/nutrition and fitness on the internet, I want to back it up with some actual personal experience and evidence, because so many professed "health and fitness experts" on the internet don't.