I have been on a strict, very meat heavy ketogenic diet consistently for almost three years. About half that time I have been almost 100% carnivore.
I still drink an occasional cup of decaf coffee with heavy cream and sugar substitute, occasionally add very low carb condiments (ketchup, mayo, mustard, BBQ sauce, salsa, apple cider vinegar) to my food, and occasionally enjoy sugar free Jell-O with sugar free whipping cream, or keto treats made with almond or coconut flower and sugar substitutes.
My goal is to gradually give up the above and go 100% carnivore eventually.
I drink mostly water, distilled flat water and purified seltzer water. I don't drink alcohol.
I eat mostly ribeye steaks, ground beef, burger patties from the grocery store or fast food, bacon, pulled pork, pork rinds, beef brisket, air fried chicken thighs, chicken wings fried in beef tallow (Buffalo Wild Wings), whole eggs, very low carb cheese, butter, bacon grease, heavy whipping cream, shrimp, crab meat, and salmon.
There are plenty of other animal-based foods that I can eat, but the above are the ones that I really enjoy. My key to sustaining this way of eating is to never eat anything I don't enjoy, and to keep it simple, convenient, and delicious. I don't eat organ meats.
I don't count calories, don't calculate macros, don't measure ketones or glucose, don't care if my food is organic or grass-fed grass-finished. I just keep it as simple and as convenient as possible.
My favorite restaurants now are Burger King and any Brazilian steakhouse. I rarely eat out anymore.
Just in case, I have been taking Magnesium Glycinate and vitamins C, D, E (gamma), and an occasional LMNT electrolytes (Sodium Chloride, Potassium Chloride, Magnesium Malate) pocket in my water. I may not need these and probably will stop using them eventually.
I've effortlessly lost over 20 lbs, energy and mental clarity are through the roof, digestion and bowel movements are better than ever. I resolved allergies, skin tags (a symptom of insulin resistance) and other skin conditions, chronic joint and back pain, non-alcoholic fatty liver, high blood pressure, and acid reflux. My triglycerides dropped and continue to improve, while my HDL increased and continues to improve. I've never had the flu, never had COVID-19, and have only had one mild cold since starting this way of eating.