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.
If you frequently get sleepy after eating food it could be a sign that you have hypoglycemia, or low blood sugar.Hypoglycemia is not a disease but typically a symptom of another existing health problem.f you frequently get sleepy after eating food it could be a sign that you have hypoglycemia, or low blood sugar.