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.
In response, your hypothalamus gives you that full sensation. If you havenât eaten in a while and your stomach is empty, the opposite happens. You feel hunger. Other signals that tell the hypothalamus in your brain that you need to eat are chemicals released in response to eating or not eating. One of the major ones is a chemical called neuropeptide Y, or NPY. NPY is released by your brain when you havenât eaten in a while and your energy stores have dwindled.