One meal in 24 hrs... lost 21 kg in 6 months

Hi. 7 years back I got pregnant and had put on 21 kg of weight. I was 50 kg when conceived and was 71 kg when I gave a birth. 

The extra weight really bothered me and a month later I just started having only dinner. Started my day with warm honey and lemon drink and in the night just had dinner. 

I lost all my extra weight and a kilo more in approx 6 or 7 months. 

I did not know anything about Keto but for sure it was ketones that helped me to lose weight.