Here’s my story… I used non-fat, super low calorie diets for more than 30 years, yo-yoed, kept my weight mostly in a healthy BMI range, but yo-yoed constantly within that range from tip-top to lowest bottom. Each decade, I had to lower my calories even more until I was eating 800-900 calories per day and gaining weight slowly but surely. I had given up on the idea of ever getting my slim figure back again. I started keto for Alzheimer’s and cancer prevention (the illness that killed my parents), and just closed my eyes and ate all those calories - no counting, just trying to eat all that fat, which was actually hard for me to figure out how to do at first. My goal was mental clarity, but the side-effect was weight loss! Rapid weight loss! The fastest I had ever lost weight! I lost 12 pounds in 3 months without counting anything. I did measure my ketosis every day to make sure I was in it, but I didn’t measure anything else.
After the 12 pounds, I stopped losing for a while. I had only 5 pounds left to lose, so at that point, I did start paying attention to my calories, I lowered my carbs a bit, raised my fat and made it a full 80% of my calories. I dropped those 5 pounds within 6 weeks doing this. Now I’m maintaining and I eat around 1200-1300 calories per day, which includes 3oz of meat, 2 oz of cheese, low-carb veggies, and all the rest of the calories are fats. Tons of fat! I’m maintaining my weight exactly where I want it, and now I don’t have to count anything any more. I’m just cruising along, doing what works. I’m a small Asian person, very short, slender build, so I can’t carry much weight very well and have to have lower calories than most people. But I’m never hungry on this diet, which I love.