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.
Note: The digestive system uses roughly 60% of your energy while you idle about daily, so after eating large meals the digestive system takes energy from other areas of the body, allowing it to work faster, and bringing about a sleepy effect.itis. A variation and shortening of Niggaitis; The overwhelming sleepy feeling that comes over people after they have eaten too much food. Usually people get the 'itis after eating rich soul food during the holidays.