It could be as simple as your body doing what it always does. Your Automonic Nervous System is split into two parts Sympathetic and Parasympathetic.
Sympathetic is referred to as your “fight or flight” reaction. When your body is in this state blood moves to your heart, lungs, and skeletal muscles. This is so you can run from danger, stand up and fight, or even just do normal physical activity.
Parasympathetic nervous system is your “eat and sleep” reaction. It moves blood to your digestive system lowers your heart rate, and breathing. Think of the two as a teeter totter, one side is always up and one side is always down. Unless you are dead in which case both sides are down, or having an orgasm in which both sides are up.
This is why you get tired after eating, especially if you just got a workout beforehand. In the other direction this system also explains why you can get cramps after eating if you exercise. All the blood is pushed to your heart, lungs, and muscles so it does not have enough left to deal with the food you just put into it.
Hope that helps.
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When you eat more blood goes to the digestive area to help it digest, and less to the brain, therefore you feel more tired.
Because you're digesting it maybe? You're not supposed to be really active directly after eating, it can cause indigestion.
It's not uncommon actually to be tired after you eat. Your body redirects energy from cognition to digestion.
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Food coma.
Or you are not getting enough sleep daily.That's normal if you had a large meal
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