I came from moderate carb Always Hungry by Dr David Ludwig. Of course, I did best on that when I didnāt add the slow carbs I was supposed to have. He seems to think that keto is too restrictive, even if science points to great data from keto. Iāve also been lower carb than the SAD for 9 years, as I discovered gluten was causing my migraines and I didnāt see much point in using GF substitutes but rather went for whole-er foods. Still had tons of sugar though. 
Iām loving keto, and it seems to love me back. Back in the not-so-good-old days Iām know I could put down 3,000-7,000 kcal in a day. Malabsorption will let you āget away withā a lot. I never exceeded 210 on my 5ā7ā frame. I never did calorie restriction of any type for more than a week or two, so despite my interesting gut history, I seem to have a rather robust metabolism. Iām thankful for that for sure!!!