This is the type of vitamin D that circulates in the blood. Itâs considered a good reflection of how much vitamin D youâve absorbed from sun exposure and taken in from foods. Levels of vitamin D are expressed in nanomoles/liter (nmol/L) or nanograms/milliliter (ng/mL). According to the Office of Dietary Supplements (ODS), the results can indicate the following:
Other Health Conditions. On rare occasions, being tired after a meal or simply sleepy all the time could be a sign of another health problem. Diabetes, anemia, underactive thyroid, celiac disease, food intolerance, and sleep apnea can make post-meal drowsiness worse.
Causes of Nausea after Eating. Many causes can be instrumental in causing nausea after eating. Here, we will take a closer look at some of these causes. Allergies â Food allergies are the most common cause of nausea after eating. This can be allergies to various ingredients in food, such as, preservatives and additives etc. or to the food itself. Some allergies cause digestion problems as well. There are also times when you may feel nauseous after every meal.