Hi Dr Zac, every Christmas I encounter the exact same conundrum. I wake up with bounding energy but right after lunch, around 3pm, I become lethargic to the point I must have a nap. Can you explain the science behind my Christmas food coma?Matty, 45, South AustraliaA food coma isn’t just an excuse to avoid small talk at the table, there is real science behind why you feel lethargic after a big meal. There are some basic tricks to dodge the drowsiness to keep you awake all day.
I’m sure someone at the Christmas table will try and tell you the reason for your drowsiness is because blood is directed away from our brain to your gut. That’s not correct: it’s proven our muscles are given less blood, which is why you may feel weak after a big meal. Particular amino acids, such as Tryptophan, trigger relaxation hormones. The high insulin levels caused by Christmas lunch, might make it easier for these amino acids to get into our brain and subsequently set off our relaxation signalling pathway.It’s also found in spinach, soy, eggs, cheese, tofu and fish.
My other advice is to drink plenty of water before, during and after lunch. Try upping your electrolyte levels by sipping on coconut water or cucumber water.Exercise in the morning may keep you feeling fit all day, as long as it isn’t too strenuous on your body. And if you really want to have energy to burn during the afternoon’s backyard cricket match – limit your alcohol intake. You will be amazed at how much more energy you will have.
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