3 Kilos in 1 week

I’m a big fan of Dr. Berg and I let his videos brainwash me. I lost 3 kilos in one week by eating only 1-2 meals per day. And now I want to lose more weight by controlling carbs and sugar. But I love Sushi, I hope it’s ok to spoil myself once per week. Btw, I feel extremely thirsty when I’m not eating. Maybe my body needs water to burn fat.