Yes, I had tried keto and fasting. Both worked for about 40-60 pounds and then I would hit a plateau and no matter what I would eat or not eat, the weight would slowly return. But, I was not put on this for weight, but for blood sugar that was out of control. The meds and diet would not control it. Sadly, I still need to lose a bit more before I can start walking and working toward adding real exercise to the mix.
A few years back I went hard on the low carb, 20 a day for a month and then up to 30 the next month. Lost nothing, no inches, no weight. Thing is 30 yrs earlier I had lost 100 lbs on low carb and kept it off for 20 yrs. After nearly 3 months I finally broke out in strange blisters on my hands and had to increase carb intake.