Hi there Elephant, welcome!

Yes, fluctuations of several pounds are bound to be water weight. Low Carb weight loss often occurs in fits and starts so don't worry if you have to wait a while for your next "whoosh" of weight loss. Just keep following your programme and all will be well.

Feeling weak and light headed can be caused by a lack of potassium. During Induction, we tend to lose a lot of extra water, which can lead to a potassium deficiency.

You replace potassium either by taking tablets, or switching to a potassium salt such as Nu Salt or No Salt (just sprinkle on your food, as with normal salt).

The Drs Eades (authors of Protein Power) suggest that early in low carbing an extra 400mg daily is a good idea.
If you take the tablets, they should be taken in divided doses, and with food, as they may otherwise cause stomach irritation.

Are you drinking plenty of water? You will especially need plenty while taking potassium.

One more thing: People who are taking tablets for high blood pressure or fluid tablets should not take potassium supplements without first checking with their pharmacist.

Happy low carbing to you!

Rosebud