02/07/2025
Today I am sharing with you information about fasting!
Most of us are told before we get blood tests from our doctors to fast for at least 8 hours. What does that mean exactly?
Has your doctor ever explained to you what fasting is?
Most of us take for granted the belief that after 8 hours of not eating we are fasted and good to go for our blood tests. But are we?
Dr and Professor Benjamin Bikman is probably one of the worlds leading experts on metabolism and fat metabolism and his definition of a fasted state is the state our bodies are in with the absence of insulin. Insulin is another discussion, but its our energy storage hormone and we cannot store or metabolize fat without it.
So then the question becomes, what raises insulin and keeps it elevated in our blood? And, is 8 hours always enough time for it to leave our blood stream?
Insulin's main function is to move energy, mainly glucose, from our blood into our cells for later use and storage. This means we experience spikes to our blood sugars first after eating, and then our body secretes insulin to deal with it. Our body wants to protect itself and return to a normal and healthy rested and fasted state after a meal and so during digestion and processing of the glucose molecules in our blood, insulin lingers and hangs around for a little while after we have digested our food fully. Not necessarily fully leaving our bloodstreams before we go get blood work. Sometimes insulin can be elevated for longer than 8 hours and indeed longer than even 10 or sometimes 12 hours. This is a result of a very carbohydrate heavy meal.
Since insulin requires time to work, and it sticks around for sometimes hours after we finish eating, then by eating every few hours and always keeping our insulin high, we are layering insulin spikes on top of insulin spikes. This can lead to a condition known as insulin Resistance, which is where your cells will stop responding to insulin properly and that's where many of us get hung up. We start taking prescription Metformin to bring our blood sugars down, without changing how we eat.
What this means is that there is a high probability that your blood test will be inaccurate in diagnosing your health if you over consume carbohydrates regularly, because when you were checked you potentially still had higher than fasted levels of insulin. This is a problem that requires education for us all to understand our bodies and where we are sitting in our metabolic health.
Eat well and be healthy!