Were you eating any fat?
Here's a useful 5-page guide from Dr Eric Westman who is one of the world leaders in LCHF.
https://www.dietdoctor.com/se/wp-content/2014/10/no_sugar_no_starch_diet.pdf
I've been kind of doing my own thing and am losing weight but looking at that doc, the yogurt I have for breakfast is too carby. Looking at my charts, I've been eating about 30g net carbs each day, total is in the region of 50g. So I think I've been very lucky. Back to eggs for breakfast then!
