In reply to jennifer.

It's true, ketone strips do not always work perfectly and may show different levels of ketosis in different people. This is because they read excess levels of ketones in the urine. You may well be in ketosis but are not producing excess ketones. The best way to know is feeling it - do you have more energy, sleep better, feel better, etc.? Are you losing weight slowly but surely? These are all signs of ketosis.