Do you often feel sleepy right after a meal? In fact, the main reason may be that what you ate wasn't quite right. Some foods, once in our stomachs, can cause our blood sugar to spike quickly, easily leading to drowsiness.
For example, with rice, eating white rice can make you feel drowsy, whereas eating brown rice is slightly better. The same goes for vegetables; root vegetables can cause blood sugar to rise quickly, while leafy vegetables don't have as significant an effect.
Additionally, eating too greasy food can also make you feel drowsy, so it's best to keep your diet a bit lighter. If you're not cooking for yourself, you can rinse your food in hot water. Also, maintain regular meal times but reduce the portion size for each meal. Between meals, you can have an extra snack; for example, have some fruit or nuts three hours after lunch.