One question I get all the time goes something like this, "I started a low carb, high fat (LCHF) or the Zero Carb (eating only meat, eggs, cheese, butter, no plant based foods) way of eating and my morning blood sugars are going up. What's wrong?" The answer is "probably nothing". It's probably a good thing. Here's why. The reason you're starting this diet in the first place is probably because you are overweight or have diabetes. In both cases your are almost certainly "Insulin Resistant" which is discussed further below. In this case the most like scenario for your newly elevated blood sugars is this. Your liver does not respond normally to insulin when your sugar rises as it should in the morning with the morning Cortisol surge, a perfectly normal and expected daily phenomenon in humans. Cortisol causes the blood sugar to rise which should trigger insulin release which should signal your liver to stop making more sugar from glycogen. In insulin resistant people this feedback loop is broken and the liver keeps churning out sugar ignoring the insulin and sending your blood sugar up. Interestingly the drug Metformin which you may have taken at some point works mainly by shutting down glucose production in the liver. This process is called the "Cortisol Awakening Response". One reason your morning sugars may be going up is that your adrenal glands which make cortisol are getting healthy again since you are giving them the raw material they need to make cortisol, namely Cholesterol. This healthgiving nutrient is abundant if you are eating the Zero Carb or LCHF way. Here's a quote from the Wikipedia. "Cortisol is synthesized from Cholesterol" .
When it comes to eating what anyone should really know about their food is "how high does my blood sugar go up after I eat it?" If it goes over 140 at 60-90 minutes after the meal then that's a problem. Over 200 is a big problem. So if you want to check something useful, check your sugar 60-90 minutes after eating. There's a great Swedish Doctor who gave a lecture that covered just this topic well.
I think checking the blood sugar before eating in the morning does not give useful information unless you need to do so to regulate insulin. First a blood sugar measured after eating is more sensitive for picking up insulin resistance also called "The Metabolic Syndrome" than a fasting blood sugar and can detect it as much as a year earlier than the fasting value. The Metabolic syndrome if untreated in most cases will progress to diabetes and is the root cause of heart disease, stroke, kidney failure, limb amputation, blindness and many other related problems of which insulin resistance is the underlying problem.
And finally what you want to know is "is this way of eating bringing my sugars down. A fasting sugar is going to give you faulty information for the reasons noted above. The blood sugars taken 60-90 minutes after eating are going to tell you whether what you are eating is going to raise your blood sugar or not. That is important because it is these very high blood sugars after eating that do most of the damage to your body. And ultimately you need to follow your Hemoglobin A1c tests every 3-6 months until they become normal because they are the best measure of how high your blood sugars have been over the last few months and how much damage high sugar is likely to be doing to your body!