In the Caribbean, food coma, known as "itis," happens after one eats foods such as meats and sauces and other forms of soul food that are high in fat and carbohydrates and more likely to cause sleepiness.
According to Wikipedia, "A biological mechanism known as the shell-core effect causes the circulatory system to redirect blood-flow from the extremities to vital core-level processes (i.e., regulating core body temperature). As a result, the brain's intake of oxygenated blood is restricted so that the stomach can metabolize large quantities of complex carbohydrates."
Other foods more likely to lull you into a mid-afternoon snooze contain tryptophan. Guilty of putting turkey-eaters to sleep, "tryptophan is the amino acid that the body uses to make serotonin, the neurotransmitter that slows down nerve traffic so your brain isn't so busy." These kinds of foods include pasta, scrambled eggs, cheese, and tuna salad sandwiches.
Make that meal part of a combo and take a walk after you eat. Help your food digest by moving and not slumping back into your swivel chair. According to an article on WholeApproach.com, "a brisk twenty to thirty minute walk after a meal helps activate digestion."
So while saying goodbye to lunchtime favorites like mocha cappuccinos, potato chips, and tuna sandwiches may be difficult, remember this: by learning how to conquer the food coma slump, you will not only boost your energy and improve your work performance, but you may also say "hello" to a raise.