I must say this ketosis and fasting sounds very wierd to me. I like a healthy diet of meat and potatos and oatmeal in the morning and so on. And i would hate to starve for a full day. I dont even count calories I just eat a healthy menu of whole foods wich for me seems very natural and is enjoyable. TBH i have not even heard of keto diet before. Thank you for bringing this up to me, i will have to do some research on this. But probably i would use something extreme-ish like this only as a last resource.