In the beginning you will lose weight rapidly, but this usually stabilizes to a comfortable level. If you find yourself losing weight too quickly (more than 2 lb a week on average) you need to re-calculate the amount you are eating. Fast weight loss is immensely rewarding mentally but requires more effort and is harsher on the body. When we lose weight too quickly there can also be a yo-yo effect as the body tries to bring itself back into balance. Find the ideal rate to suit your needs while ensuring you are consuming enough nutrition.
Rapid weight loss becomes and an issue if you:
Are not eating enough and so are losing muscle tissue;
Feel sick, fatigued or dizzy.
Are pregnant or breastfeeding (the keto diet is not recommended for pregnant women without medical supervision)