I am new to Atkins. Today is my fourth day. In the past three days I've already lost 6 lbs. I know a lot of it is water, but that seems like a lot. I've never lost weight so fast in my life, and I've done these low carb diets before. I drink about 80 oz. of water per day. I'm eating 18-20 carbs per day while on induction. I eat about 1600 calories per day with my ratios as 60% fat, 35% protein and 5% carbs. Is this safe?