Why Do Blood Sugar Levels Spike

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How Do Fats & Proteins Affect Blood Sugar Levels?

After you eat, your blood sugar levels increase and trigger the release of insulin, an important hormone in managing how your body uses glucose. Different types of nutrients affect blood sugar differently, and maintaining an appropriate intake of carbohydrates, proteins and fats will help control blood sugar levels and prevent or manage metabolic diseases like Type 2 diabetes. Carbohydrates, proteins and fats are the three macronutrients your body needs. Carbohydrates are primarily used for energy, while proteins are important for rebuilding tissue, and fats are important for maintaining cell membranes and facilitating vitamin absorption, among other functions. Carbohydrates have the most significant impact on blood sugar, so carbohydrate intake should be monitored closely by individuals with or at risk for Type 2 diabetes. Protein's Effects on Blood Sugar Compared to carbohydrates, protein keeps blood sugar levels steady. When consumed alone, protein does not generate a rise in blood sugar. According to a study published in 2003 in “American Society for Clinical Nutrition,” individuals with Type 2 diabetes who maintained a 30:40:30 intake ratio of protein to carbohydrates to f Continue reading >>

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  1. Liang-Hai Sie

    What you feel is called Postprandial somnolence .
    For ages we believed in the myth that this was because after a meal much blood would be diverted to the gut, so the brain gets less blood, this has been debunked see Debunking a myth: neurohormonal and vagal modulation of sleep centers, not redistribution of blood flow, may account for postprandial somnolence.
    Many people thought that the food composition (high or low carbs causing or not causing a glucose spike after the meal) could influence this after meal sleepiness, this too has been shown not to be true see Meal composition and its effect on postprandial sleepiness. : no difference between a high carb or high fat meal.

    The latest hypothesis is that the production of Orexin , a wakefulness promoting neuropeptide transmitter produced in the lateral hypothalamus, the production of which is inhibited by high blood sugar levels and Leptin (a hormone secreted by the body's fat cells that inhibits hunger), so after a meal there would be less orexin, thus less wakefulness. See Page on researchgate.net "Metabolic state signalling through central hypocretin/orexin neurons".

  2. Stuart Lewis

    Change what you eat. And exercise more.
    You're probably eating too many carbohydrates which spike your blood glucose level. This stimulates the release of insulin and this cycle is known to make people tired.
    Try a high protein breakfast such as egg and see if that changes things. Frequent exercise also improves your body's response to carbohydrates.

  3. Ian Osmond

    Other people have already given strong answers to what might be happening physiologically, and have made suggestions of other ways to eat that might work differently.
    I won't duplicate that, but will make one further, general observation.
    You said that, when you eat breakfast, you feel sleepy, and, when you don't, you feel fine.
    If "not eating breakfast" works for you, then do that. We are, each one of us, vastly complicated systems, and we all work slightly differently. It might be that, for whatever reason, "not eating breakfast" is the best plan for you.
    It's not a bad idea to try out the other ways of eating other people have suggested, but, in the end, pay attention to what YOU need, and how YOU feel, and do the thing that makes you feel better. Does that mean eating a little bit right when you wake up? Or eating a lot? Or not eating anything until midday?
    Eating only protein in the morning, or only fruit, or starchy foods like bread or pancakes? Eating things with lots of fiber, or eating simple, easily-digestible things?
    Each of those might be the best choice for a different person. Try them out, and any other variation that seems reasonable to you. And pay attention to what different things do for you, and do the ones that work best for you.

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