Have you tried eating same amount of calories from other sources?
Sure - like many folks I was raised on the low-fat mantra. I did plenty of diets way back when that were only caloric restriction based diets. The power of keto is the management of the weight control hormones. This means that your brain is rewired to no longer tell you you're hungry when you really don't need more food. When you're on the roller coaster of the typical blood sugar cycle, the only thing you have going for you on a strictly caloric controlled diet is your will power. Good luck with that...