The two most common reasons for tiredness after eating are food allergies and eating foods that contain certain substances that increase fatigue.
The first question to ask yourself when you are trying to determine why you feel tired after eating is does it always occur after a certain meal?
A classic symptom of food allergies is feeling tired after eating a food you are allergic too. That’s because when you are allergic to a food – or any substance for that matter – your body creates antibodies to fight the “intruder.” This requires energy, which makes you tired. If you suspect that you have a food allergy that is making you tired after eating, try an elimination diet.
If you’re not sure which food or foods you’re allergic to, you will need to experiment by eliminating a different food each week. While you may not be allergic to sugar, eating too much of it can cause tiredness after eating. While this will provide you with a burst of energy, the energy from sugar does not last long, and you will feel tired as soon as your body uses up the energy.
You can reduce the likelihood of feeling tired after eating by switching from refined (white) sugar and flour products to whole grains and high-fiber foods like fruits and vegetables, which take a longer time to digest. If you are diabetic, you probably already know that eating sugars and starches will cause you to feel tired after eating.
If you feel extreme tiredness after eating, you might want to ask your doctor to test your blood glucose levels.
You might also experience extreme tiredness after eating if you are prone to hypoglycemia or low blood sugar. While this sounds like the opposite of diabetes, it actually has the same effect when it comes to feeling sluggish after eating a meal that is high in sugars and refined starches. That’s because sugars and starches cause insulin levels to rise, and high insulin levels cause you to feel tired. In addition, starches trigger the production of serotonin, which is intended to relax the body.
Certain foods contain an amino acid known as tryptophan that is often to blame for tiredness after eating. The body uses tryptophan to manufacturer serotonin and melatonin, which are both neurotransmitters that have a calming effect. If you eat a high-fat meal, you will feel tired after eating because fat is harder for the body to digest than carbohydrates and protein. When you eat a lot of fat, your digestive system becomes sluggish, and your body sends more blood to your digestive organs so that the job of digesting your food can be done.
The result is a decrease in blood flow to other parts of your body, which leaves you with a feeling of fatigue.
Too much food means your digestive system has to worker harder than it should and, again, you will feel tired after eating. While you may not think of drinking alcohol in relation to feeling tired after eating, if you have a few beers or a glass of wine with a meal, it may be the alcohol that is making you tired. Alcohol is a depressant, and it may also make you eat more, which will cause your digestive system to work extra.
If you find that you are often tired after eating, you need to develop a diet plan that will energize you rather than make you tired. I went to the Life Extension Foundation (“LEF”) website and purchased their Male Hormone Blood Test Panel, got my blood drawn, received the lab report and reviewed the results on the phone with a LEF doctor. About a month ago, in August, I again got my blood analyzed, but this time I included a very comprehensive cholesterol-oriented test offered by LEF called VAP. I’ll have plenty to report about these tests in the future; in fact, this post will begin a series of posts on the subject of knowing your blood numbers, and responding accordingly. Glucose, Serum is a test that measures the amount of a sugar called glucose in a sample of your blood. Carbohydrates, which are abundant in fruit, cereal, bread, pasta, and rice, are quickly turned into glucose in your body, which then raises your blood glucose level.

Over time, too many carbs too often can impede your insulin’s ability to remove excess glucose from the blood, a potential problem, as any diabetic can tell you. When your body does not produce sufficient insulin or has become resistant to insulin, the blood sugar level in your body increases because it is unable to enter the cells.
Some sources say that a blood sugar level of 100 is within acceptable limits, and others, like LEF, say it’s of concern. As psychologists would term it, I’m having “cognitive dissonance”; meaning, a blood sugar level of 100 doesn’t fit with my perception of what should be true. When it comes to diet, the only thing I wonder about is if my recent practice of intermittent fasting could affect blood sugar negatively.
I also have been experimenting with so-called “Bulletproof Coffee”, basically coconut oil blended with high quality coffee (I abstain from the butter), which add another 150 calories from the heaping tablespoon of the coconut oil, for a total of 300 calories ingested from morning till 1:30 PM.
Let me underscore that this selection DOES NOT reflect my interpretation of the best supplements to take among the LEF list of suggestions. My blood sugar monitoring will also include non-fasting measurements taken two hours after lunch and dinner, as well as after exercise. I’ll end this post with the aforementioned video showing how I intend to monitor my blood sugar.
You're gonna get (1) the Newsletter, (2) the four-part guide, Transform Your Body and Mind, and (3) the 12 Ageproof Biohacks. You will need a glucose meter, alcohol pads, sterile finger lancets and sterile test strips. If your insurance plan doesn't pay for glucose meters, ask your doctor which meters he or she recommends. For someone who has severe diabetes, continuous blood sugar monitoring may be a viable option. The following are some suggestions on when to do SMBG testing and how to use the results to improve your blood sugar control. If you get blood from your fingertip, try washing your hands in hot water to get the blood flowing.
Recommendations for the best time of day to test your blood sugar depend on your medicine, mealtimes and blood sugar control. Portions of this article were developed as part of an educational program made possible by an unrestricted educational grant from LifeScan, Inc., makers of OneTouch Blood Glucose Meters. Portions of this article were developed by the American Academy of Family Physicians in cooperation with the American Diabetes Association.
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Common food allergies include gluten (the protein in wheat), dairy products and tree nuts, but sensitivity to any food can cause fatigue. Or you can try limiting what you eat and slowly reintroducing foods back into your diet until you find the one that is causing that tiredness after eating. Sugar is a refined carbohydrate that sends your blood sugar level way up as soon as you eat it. The carbohydrates cause the pancreas to release insulin and also cause other amino acids to leave the bloodstream and enter muscles cells. A buddy of mine had been taking a bio-identical testosterone medication prescribed by his doctor, and I observed him gradually go from being a bit listless to an energetic mojo-pumped happy sorta guy. Yes, “naturally”, because, indeed, my testosterone numbers were low and I wanted to try boost them through supplementation, extra weight-bearing exercise and ingesting more protein, rather than by some testosterone patch, cream or injections.
Glucose is a major source of energy for most cells of the body, including those in the brain.
After you eat, carbohydrates break down into sugar and enter the bloodstream in the form of glucose, a sugar that serves as a primary source of energy. I exercise regularly (mobility exercises every morning, resistance training three times per week, cardio twice, yoga twice), eat a nutritious, low carb diet, get eight hours of sleep most nights, and meditate regularly. More alarming, as the video below shows, a self-administered test using implements designed for diabetics showed my fasting blood sugar number to be 110 this morning.

So, I will not be content with a modest decrease from my 100 LEF score, or 110 self-administered test results. Stay tune for updates on this subject and for more posts about the other unsavory results from last months LEF blood tests. I'm a big believer in sustainability, and am a bit nutty about optimizing my diet, supplements, hormones and exercise. One of these tests is called an A1C test, which reflects your blood sugar (or blood glucose) control over the past 2-3 months. Using a blood glucose monitor to do SMBG testing can help you improve control of your blood sugar levels. Food and Drug Administration (FDA) has approved meters that work without pricking your finger. With these systems, blood sugar is measured constantly through a sensor placed beneath the skin that transmits information. Testing times are based on the kind of medicine you take and on how well your blood sugar levels are controlled. When you are sick, even without eating, your sugar levels may run high, so testing is important.
Continue testing more often until you have maintained your SMBG goal values for at least 1 week, or until your doctor advises you that more frequent testing is no longer necessary.
What kinds of foods do you typically eat, and which ones have you just eaten when you feel extreme tiredness after eating?
Blood sugar that’s out of control is turning the people of this nation into pre-diabetics, most having no clue that they’re on the path to becoming diabetic. I knew from my readings on the topic that most men begin to lose testosterone soon after 30. Normally, the pancreas responds by producing insulin, which allows sugar to enter the tissues. I didn’t list “improving my diet” or some such thing, because at the moment I don’t know how I’d make it better relative to improving my blood sugar.
Within one-half hour of arising, I ingest about 30 grams of protein powder mixed with water, and one heaping tablespoon of flax seed powder, together about 150 calories.
Testing your A1C level every 3 months is the best way for you and your doctor to understand how well your blood sugar levels are controlled. Different meters work differently, so be sure to check with your doctor for advice specifically for you. However, with some meters, you can also use your forearm, thigh or the fleshy part of your hand. You may also want to keep track of what you have eaten, when you took medicine or insulin, and how active you have been during the day. Is it possible, that despite all the healthy things I do, that I’m on that path too?  Are you??
Every person who has diabetes should have a blood glucose monitor (also called a home blood sugar meter, a glucometer, or a glucose meter) and know how to use it. You'll also check it more often when you feel sick or stressed, when you change your medicine or if you're pregnant.
If you want to pay a little more money, you can get a meter that stores the results in its memory. Talk with your doctor about what is a good range for your blood sugar level and what to do if your blood sugar is not within that range.

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